In the end, Tsunade chose the old path Orochimaru had proposed. Once her vitality improved further, she might have been able to learn Wood Release through her own efforts, but she still chose to have Hashirama Senju's Cells implanted.
Someone had to inherit her grandfather's Wood Release.
Besides, Tsunade's instincts told her that merging with Hashirama Senju's Cells would greatly strengthen her.
"I'll train you after this so you can adapt to your current strength as quickly as possible," Uchiha Yi said, looking over Uchiha Mikoto, Kushina Uzumaki, and Nawaki.
"Yes!" The three could hardly wait.
Of the three, Kushina Uzumaki was now the strongest. Nine-Tails Chakra Mode had propelled her straight to Kage-level strength, and she was no weakling even among Kage. In that respect, she was much like the future Naruto Uzumaki.
But Kushina Uzumaki's body was still a little too weak. Without Asura Chakra, she would need to grow stronger before she could bear the Nine-Tails' full power.
Perhaps she would manage it at eighteen, twenty, or even twenty-five.
Naruto Uzumaki's case was unusual. With only half the Uzumaki Bloodline, he was an imperfect fit. If not for Asura Chakra, he would not have been particularly suited to becoming the Nine-Tails Jinchuriki.
To help Naruto Uzumaki bear the Nine-Tails' power, Minato Namikaze had gone so far as to split it in two and seal the Yang Nine-Tails inside him. The Yang Nine-Tails' endless Yang Release Chakra had, to some extent, strengthened Naruto Uzumaki's body.
That was different from carrying the full Nine-Tails.
The full Nine-Tails was certainly more powerful, but the Yang Nine-Tails might have been more beneficial to its Jinchūriki.
If they could put a Yin Nine-Tails inside a member of the Uchiha Clan, it might help awaken that person's Sharingan sooner. It might even help