For some time afterward, Naruto and Kakashi studied how to control the Nine-Tails' chakra.
The simplest method would have been for Yeyu, Sasuke, or Neji to step in and tame the Nine-Tails.
But that way, the Nine-Tails would only submit to strength—or rather, to Yeyu and the other two.
It would not submit to Naruto.
Naruto needed to tame his own Tailed Beast himself.
Just like Otsutsuki Shuho, all Yeyu could do was seal him inside Neji and Sasuke.
As for whether Otsutsuki Shuho would give them a God Tree and enhance their eyes, that could only depend on themselves.
Yet in just over a year, the two had already made Otsutsuki Shuho at least willing to give them each a God Tree.
Their eyes had improved greatly as well, and their bloodlines had been purified to the level of the Otsutsuki clan.
Throughout the whole process, the only thing Yeyu had done was the same thing Minato Namikaze had done: seal power within the two of them.
The difference was that no matter what Otsutsuki Shuho did, he could not break through Yeyu's seal.
Meanwhile, the Nine-Tails could continuously influence Naruto through the loopholes deliberately left by the Fourth Hokage.
Sometimes, it even caused him to go berserk.
That was something Otsutsuki Shuho could not do.
His strength far surpassed that of the Nine-Tails, yet he had never been able to shake the seal Yeyu had set.
He could not even tempt Neji and Sasuke into undoing the seal, because neither of them had any way to release it.
Only Yeyu could undo it.
This made Otsutsuki Shuho feel that he might have to remain inside the two of them for the rest of his life.
He kept cultivating, only to discover that the seal grew stronger alongside him.