Regarding the Jinchuriki issue, Senju Hashirama agreed after only a brief hesitation.
The use of Tailed Beast power had always been a thorny problem for ninjas. How to wield a Tailed Beast's power flexibly was a question generations of ninjas had pondered.
However, the ninjas of the past had not even been able to capture Tailed Beasts, so the issue could only remain at the stage of contemplation.
But now that Konoha had been established, everything was different. The Tailed Beasts had truly been captured, and research into how to use them had in fact begun long ago.
After receiving the Hokage's approval, Konoha secretly began developing Jinchuriki.
The development of any new ninjutsu was never smooth sailing, especially research of such epoch-making significance.
In secret, an unknown number of ninja test subjects died. Due to the immaturity of the technology and Sealing Techniques, ordinary ninjas simply could not withstand the Tailed Beasts' violent chakra. Not long after one was sealed into their bodies, they would explode and die.
That was not all. The Tailed Beasts could then go berserk through their bodies, causing enormous trouble.
Thus, Senju Hashirama had no choice but to halt the project. If he had known there would be such heavy casualties, he would never have approved it so rashly.
But by then, the Jinchuriki project had already progressed to a very deep stage. If it were halted outright, all previous research would go to waste.
For a time, Senju Hashirama found himself in a dilemma.
At such a time, Uzumaki Suiling, who had only recently given birth, stepped forward and said she was willing to share her husband's burdens.
No one knew how she convinced Senju Hashirama, but in the end, Hashirama agreed.
Thus, Uzumaki Suiling became the Jinchuriki test subject, and the Tailed