Sōsuke Aizen, a liar, both in the original work and in this timeline, even with Jun present, he still went down his own path.
Unlike Jun, many people know what Jun is doing, and he has been quietly changing Soul Society. In many people's eyes, Jun is a Don Quixote, an overconfident person.
Aizen? He's a complete fraud. He pretends to be a diligent Soul Reaper in Soul Society, but behind the scenes, he does something entirely different. He wants to kill many people; he wants to rule Soul Society.
Therefore, everyone's impression of Aizen was not good, but they only felt incomprehension and admiration for Jun. Sajin Komamura's reaction was the most obvious; despite standing on the righteous path, he ultimately made way for Jun.
So how did Aizen come to be who he is today? No one is born a liar; Aizen went through countless trials and tribulations before finally becoming the Aizen he is today.
His mother died on Expedition, and his father worked diligently for the Soul Society, but what did the Aizen Soul Society gain from it? Nothing.
In Soul Society, the labor and rewards are disproportionate, especially the long and meaningless Expeditions. These were created by the Central 46 of the Noble Family to limit the number of Soul Reaper, with a very simple purpose: to kill.
Chun's actions fundamentally overthrew the aristocracy, but the aristocracy lacked true power, and many of them didn't mind being overthrown; only the incompetent feared it all.
Many Japan works depict the immense conflict between nobles and talented individuals. For example, in the Thousand-Year War arc of the original manga, the Central 46 initially refused to release Aizen, but after Kyōraku asked, "Is it alright if Soul Society is destroyed?", the Central 46 released him.
For example, in Hokage, it's mentioned that there are many countries, and ninja villages are just institutions under those countries. And before the end of the original work, there was indeed a meeting of the Five Great Kage. We can see what the Five Great Kage really are – a bunch of useless idiots.
This kind of plot and political hierarchy frequently appears in many Japan works. They are a country like this, from ancient times to the present, and the Soul Society is no exception. In Japan, status is never as important as ability, which has also led to another tradition: the underdog overthrowing the superior.
Why is Nobunaga Oda called the "Demon King" in Japan? He was so lawless that he actually tried to abolish the Emperor. Meanwhile, Toyotomi Hideyoshi, another widely praised Toyotomi Hideyoshi, ultimately held the position of Kanpaku (regent), not Shogun. Nobunaga was the Grand Minister of State, while Tokugawa Hideyoshi was the Shogun.
What's the difference? Without going into too much detail, the difference lies in their social status. Toyotomi Hideyoshi was a commoner; the only position he could ultimately hold was that of Kanpaku (regent), unless he overthrew the Emperor. The other two were nobles. Although the Regent (Daijo-daijin) and Kanpaku were of equal rank, in that era, Toyotomi Hideyoshi simply couldn't become Dajo-daijin, let alone Shogun.
Now, let's shift the focus to Aizen. Aizen isn't an aristocrat, and following the normal path, the highest position he could achieve would be Captain-Commander. However, we see Kyōraku's humility towards the Central 46 in the Thousand-Year War arc. Without changing this, even if he becomes Captain-Commander, he'll remain humble forever.
Therefore, although Aizen and Jun aimed to destroy the existing Soul Society's class system, their difference lay in their perspectives. Jun, coming from the modern era, clearly understood that as knowledge spread, social structures and classes would inevitably change.
However, Aizen was unaware of this, so in the end, he could only be like Nobunaga Oda, misunderstood by everyone at the time, his actions considered treasonous, and anyone educated in that era would inevitably oppose him.
Furthermore, Aizen's limited knowledge and perspective meant he could only see so much; his education was limited to that of the Soul Society. Therefore, following the practices of the Soul Society, he accumulated strength, meticulously planned, and prepared to overthrow everything.
In this process, he inevitably had to disguise himself, and his purpose could not be revealed or told to anyone—this is deception. After Aizen made this preparation from the beginning and carried out his plan for over a hundred years, his essence and actions became assimilated, thus his Shikai became Kyōka Suigetsu.
His solution will be an even greater deception.
"Because I understand you, my senior, my best friend."
Aizen responded to Jun's answer with a soft snort, saying, "Only one chance."
"A solution that can only be used once? The cost is truly enormous."
"Yes"
Chun and the others were still watching the battle in the distance when the third wave of ten people entered the Soul King Palace area and quickly arrived at Chun's side.
Natasha's face was deathly pale. "How come there are only a few of you left?"
"Right"
Natasha was incredulous and speechless; the others were even more at a loss for words, and could only sigh.
"Are you still willing to believe me?"
Starrk was also in this wave; he was one of the first to follow Pure. "Can you save them?"
"There's a chance!"
"Alright, tell me what you want me to do."
"Go to hell"
"Okay, our enemy is that fireball, right?"
"Right"
"I'll go first then."
"Big brother!"
Starrk smiled slightly. "I had nothing to begin with, and now I have everything. If there is any such thing as a debt of gratitude, I should repay it. Besides, didn't Chun say he would save you?"
Tōshirō drew his Hyōrinmaru and unleashed his power. This release was unlike any before; it was as if an Ice Dragon had descended upon the world. The Little Lion was completely enveloped in frost, wearing a helmet shaped like Ice Dragon, with a wingspan of nearly ten meters and a large tail made of ice.
"Captain Shimizu, is that an enemy?"
"What you think?"
"I don't know, but I do know that Rangiku and her child had just met the child's father, and now they are an orphan and a widow."
"Oh? Yin has a child? Boy or girl?"
"It's a girl. Rangiku hasn't named her yet. Gin Ichimaru said he'll name his daughter when he gets back."
"Ha," Chun didn't know what to say. What a huge flag! Gin Ichimaru's sword had no defensive capabilities, so he was instantly killed. There was nothing he could do. "Don't worry, he'll be back."
"Then I'll go too!"
Tōshirō rushed forward, Natasha glared at Jun, said nothing, and also charged up. Uryū had already fallen, landing on the protective barrier to await his death. Ichigo also rushed forward. Except for Jun and Aizen, everyone else charged up.
"Do you think that guy will be eliminated?" From Aizen and Jun's current perspective, the battle situation was very promising, so Aizen asked this question.
"You don't need to undo the debuff now that he's been eliminated?" Jun asked with a smile as he looked at Aizen.
Aizen sighed, "If we have to use it anyway, how about I use it now?"
No! I'm waiting, waiting for something.
"Waiting for the person who caused all of this?"
"Right!"
Who is it?
I can't say!
"Are there such mysterious people in Soul Society?"
"I don't know his abilities, no, I don't know exactly how capable he is, that's a more accurate way to put it."
Aizen was now genuinely curious. "There are people like this in Soul Society? Someone similar to you? The Sword God? Ōetsu Nimaiya could indeed be similar to you."
However, Jun remained silent, while Aizen muttered to himself, "By the way, where are those five from the Zero Division now? I have a feeling that if this continues, won't this monster destroy the Soul King Palace?"
"Then let him destroy the Soul King Palace as well."
Jun's sudden words made Aizen narrow his eyes, and on the other side, something even more Kongbu happened: the battle situation instantly reversed, Lord Nobunaga was killed, and it seemed that Ulquiorra's Transcendent Level form wouldn't last much longer.
With Lord Nobunaga's death, the power of the Ruler was no longer suppressed. Fireballs reappeared, killing all those who surrounded him, burning them and turning the flames into his power. The two new groups that arrived also perished in the same way.
"Yoruichi!!"
On the other side of Jun and Aizen, atop the Soul King Palace, a bewildered figure witnessed the fireball's explosive growth, instantly melting a dark-skinned woman within it, while he gained his own...
This was Kisuke Urahara. Having witnessed Yoruichi's death, he frantically leaped from the Soul King Palace, activating his Release and charging towards the fireball, but to no avail.
Kisuke Urahara's solution was to modify himself, but no matter how much he modified himself, he couldn't resist the absolute power of the Ruler and was burned to ashes.
Who is that?
"Judging from the shadow, it should be Urahara's interpretation."
Aizen narrowed his eyes, "That guy jumped from the Soul King Palace, and if he's dead too, who will know where the Hōgyoku is? Everything is ruined."
"Yeah~ everything's collapsed," Jun's tone even lightened.
Aizen was annoyed, "You really schemed against me ruthlessly!"
"This is my fault?" Jun looked at Aizen in surprise. "It's clearly the fault of the mastermind behind it all!"
"But he was scheming against you; you were scheming against me."
"He wasn't plotting against me!"
"Oh?"
At that moment, the sixth shell fired, at a very tricky angle, coming in from behind Jun and Aizen. Among those who entered this time were Retsu Unohana, Shunsui Kyōraku, Jūshirō Ukitake, Kensei Muguruma, and Sajin Komamura.
"What is that!?" Kensei Muguruma exclaimed in surprise.
Unohana calmly asked Jun and Aizen, "Where is Genryūsai?"
"He's dead. That monster crawled out of Old Man Yama's body."
"Is that so?" Unohana vanished calmly, reappearing outside the fireball. Then, with a single, blood-red slash, she cleaved the surface of the fireball. Countless blood-formed blades collided violently with the fireball, and she walked into it, then died.
It seems we've discovered something incredible.
"Ah"
Aizen and Jun were still chatting and laughing, but Kensei Muguruma was enraged.
"You two are still making sarcastic remarks!!"
"Oh? You have the nerve to say that? Who's stopping us from finding the Captain-Commander?"
"I"
Kensei Muguruma Silence, while Kyōraku and Ukitake watched in astonishment as five figures plunged into the sphere from five different angles.
"That's Zero Division!" Kyōraku was dumbfounded. How did Zero Division get involved too?
Even Ukitake couldn't calm down at this moment, "Kyōraku, I'm going!"
However, at that moment, Kyōraku did not respond to Ukitake, but instead called out a name.
"The Ichibē Hyōsube"
Then a large, fat figure suddenly appeared beside them—it was the strange monk from the Zero Division, Ichibē Hyōsube. However, before he could speak, Jun suddenly struck with his mace, smashing his head to pieces.
"Pure You"
"Let's try again, let's bring him back to life again."
How to do it?
Kyōraku was dumbfounded, but this time it was Ukitake who read the name aloud.
"The Ichibē Hyōsube"
The shattered head on his massive body instantly healed itself. He glared fiercely at Chun, then said, "I don't have much strength left. This thing can only be left to you."
"I don't need you," Chun chuckled. "That's enough, senior."
"Understood," Aizen smiled mysteriously, "Release!"
"Kyōka Suigetsu Dreamlike Empty Blossom"