In the original timeline, even Obito Uchiha himself couldn't say whether he had planned the "Nine-Tails' Rampage" for a long time or acted on impulse.
But one thing was certain: the operation wasn't a purely rational act with a clear objective. It was more like an emotional act of revenge... It wasn't the right time to collect Tailed Beasts, and Obito's attack on the Nine-Tails had little to gain beyond alerting the enemy.
The outcome of the Fourth Shinobi World War also proved how misguided Obito's actions had been. During the Nine-Tails' Rampage, the Fourth Hokage had given his own son—the so-called "Child of Prophecy"—a suitable "battery."
According to the mystical theory that every gain comes with a loss, or even the practical principle of equivalent exchange, the Fourth Hokage could be called a cursed ninja: the fastest ninja in the Shinobi World always seemed to arrive late at the most critical moment.
Obito Uchiha didn't care about his own "death," but he resented the Fourth Hokage for failing to save Rin Nohara in time. He also resented him for not recognizing his fallen student right away.
Objectively speaking, such resentment was only natural. People were selfish creatures, accustomed to judging right and wrong from their own perspective. So Obito believed that the Fourth Hokage's failure to save his student, despite being his teacher, was both wrong and incompetent.
Having such a thought was normal enough. But planning revenge based on it was another matter entirely—those eyes of Obito's weren't Sharingan at all, but Byakugan. His behavior was just too ungrateful.
As for Kakashi Hatake, he was now mired in dejection, confusion, and guilt, unable to pull himself out. More absurdly, on the Fourth Hokage's orders, he had joined the Anbu, which exposed him to even more of the village's