In the fight between Luffy and Kaido, Luffy's stored Haki was definitely inferior to Kaido's, given the vast difference in the years they had accumulated Haki. So how did Luffy manage to fight Kaido on equal terms later on?
Because Luffy's will has been honed to an unwavering degree, he is willing to destroy everything in his path to becoming the Pirate King. Therefore, the amount of Haki he can unleash in every battle is comparable to Kaido's, which is why they can fight each other on equal terms.
However, because his Haki reserves are insufficient, Luffy's fighting ability is very short-lived. He gets beaten down by Kaido every short while. During the final battle in Wano Country, Luffy rolled his eyes several times.
But through each fall and each rise, Luffy's will was Kaido, yet it did not collapse. In the very end, his will was forged as hard as iron!
It was only at this point that Luffy finally gained Nika's recognition of his abilities, and his mind and body caught up with the Devil Fruit power, which led to the Awakening of the Sun God!
Even if Luffy Awakening his Nika Form, he wouldn't be a match for Kaido, because the level of the Fish-Fish Fruit, Model: Azure Dragon and the Human-Human Fruit, Model: Nika is not much different, and Luffy had just Awakening form, so he was definitely no match for Kaido. In the end, Luffy defeated Kaido by relying on Haki.
However, in the end, Luffy only used one move to defeat Kaido. If he couldn't win with that one move, he wouldn't have a chance to use the next one. That move, Bajrang Gun, had already mobilized all of Luffy's Haki, making it impossible for him to use a second move!
This is the strongest Haki attack Luffy unleashed after repeatedly tempering his will, allowing him to mobilize all his Haki. If this attack still can't defeat Kaido, then Luffy will be the one to lose.
It can only be said that at that moment, in that attack, Luffy mobilized far more Haki than Kaido, directly overwhelming Kaido with a single, Haki blow. After that attack, Luffy's Haki was completely exhausted, but Kaido still had a considerable amount of Haki left, which he could no longer use!
This is also why Kaido's battle lasted so long. He has a huge amount of Haki stored up in his body. He fought many people in a series of battles and was able to defeat Luffy time and time again. In order to be able to fight Kaido on equal terms, Luffy had to mobilize a lot of Haki to fight Kaido, so that his reserves were quickly depleted.
When his Haki is gone, that's when he falls. How can two years of Haki training compare to Kaido's decades of accumulation? So the key to Luffy's victory over Kaido is his willpower!
Moria's will was broken by Kaido, and coupled with more than ten years of living a sedentary life, he was completely unable to use Haki when fighting Luffy. Even if he used his Devil Fruit ability in a variety of ways, he still ended up with both of Luffy being seriously injured.
In the end, the Straw Hat Pirates emerged victorious, and everyone's shadows returned to their bodies, but everyone was also badly injured and exhausted.
Just as the Straw Hat Pirates was about to rest after their victory, the Shichibukai who had been sent by the Five Elders to Water 7 on a mission to eliminate them also arrived here!
Because the person who came this time wasn't Kuma, this Shichibukai didn't hold back. Luffy had already passed out, and there were others who were injured. The only ones who still had fighting power were Zoro and Sanji, but they were also greatly exhausted. The two of them were no match for that Shichibukai!
Just as the Shichibukai was about to deliver the fatal blow, Rebecca intervened!
" Shichibukai Luffy and his crew in the Florian Triangle was Donquixote Doflamingo?"
"Yeah! I was still happy for Luffy when he defeated Moria, and then he suddenly stormed onto that big ship and attacked everyone without saying a word. In the end, he was stopped by the swordsman and the cook, but the difference in skill was too great, and he couldn't even last a single round. I had no choice but to step in!"
As Vic flew, he made a phone call to Rebecca. He had already heard a lot from Rebecca and knew that many things had changed, but so far, the overall direction had not changed much.
As for Spandam's sudden attack on Robin, Vic suspects it was Aokiji's doing, but he's not too surprised, since Aokiji appeared first in the original story before the Water 7 arc.
The Golden Den Den Mushi from the Buster Call was also given to Aokiji by Spandam. After the Enies Lobby incident, Aokiji stayed in Water 7 and eventually left with the old man, which makes it quite obvious.
To Vic's surprise, Doflamingo went to Thriller Bark, replacing Kuma from the original story. Sure enough, changing Kuma's fate will change the Straw Hat Pirates's fate!
Fortunately, Rebecca was arranged to protect him in advance; otherwise, while he was in seclusion to break through his cultivation, the Straw Hat Pirates would have been wiped out. Two years later, the Straw Hat Pirates was almost wiped out by Doflamingo, so the current Straw Hat Pirates is a hundred times more likely to be wiped out.
"What happened to Doflamingo in the end? He wasn't Shichibukai I chose. He was probably the most shameless of the Shichibukai, doing all sorts of bad things. It wouldn't be too much to just kill him outright."
"I originally wanted to kill him, but he escaped using his Stand ability. I was a bit careless at the time. Who knew he would be so easy to beat at first? I didn't even use 70% of my strength before he couldn't hold on!"
I was fooled by his displayed strength. He only used his Stand ability after I beat him half to death. I chased after him, but he still managed to escape. Next time I meet him, I'll definitely take him down!
The voice coming from the Den Den Mushi sounded a little embarrassed and annoyed, and the Den Den Mushi even mimicked some of Rebecca's expressions.
" Luffy and the others alright?"
"It's alright! I acted in time; that blond guy didn't even have a chance to kill us. Luffy and the others have already left the Florian Triangle, and they've even gained a perverted skeleton companion who likes to look at women's underwear."
"This Straw Hat Pirates is getting stranger and stranger. It was already strange that there was a cyborg monster before, but now it's even stranger. But that blond guy isn't dead, so he must have recognized me. Will this affect your plans?"
"The impact is negligible now; I'm not the same person I used to be. But you could give the Donquixote Family a call."
If Doflamingo hasn't reported your existence to the Five Elders yet, then make him keep it a secret; he won't dare disobey. If he has already reported it, then forget about it. As for Doflamingo's life, spare it for now; you'll need him later."
Vic is now a God Realm powerhouse, so he doesn't need to be so cautious anymore. Even if he falls out with the World Government, it won't matter. At worst, they can just restore their previous pursuit relationship. As long as no God Realm powerhouse is deployed, Vic can continue to hide. But the World Government will definitely be the first to suffer.
If things really fall apart, given Vic's record of defeating Big Mom, the World Government won't act rashly. As for Doflamingo's life? It's nothing, he can be wiped out with a flick of his wrist. However, leaving him with Luffy is more meaningful, as Luffy's strength owes a debt to Vic.
"Okay, I'll contact the Donquixote Family in a bit. Is there anything else you want to ask?"
"You just said that Luffy have left the Florian Triangle, so their next destination should be the Sabaody Archipelago, right?"
"It should be, that's the direction. What's wrong?"