At that thought, Yei's mind began to stir.
Where had the Eight Gates Formation come from?
Although Yei did not know who had developed the Eight Gates Formation, aside from the Might family, he truly could not think of any other way to obtain it in the Shinobi World...
Perhaps... Shinnō's purpose in going to Konoha that time had not been to discuss medical techniques with Tsunade, but... the Eight Gates Formation!
Shinnō was certainly a deeply scheming man. As a remnant of the Sky Ninja, he traveled the Shinobi World under the guise of a doctor, yet no one had discovered anything suspicious.
From that alone, it was clear that he was exceptionally skilled at concealing himself.
If his goal had been the Eight Gates Formation, then he would definitely have approached the Might family.
And based on what Orochimaru had said, Tsunade had still been in Konoha at the time, so it should not have been when the Third Shinobi World War broke out.
That meant Might Dai was likely still alive then...
And Might Dai's personality... was almost exactly the same as Gai's...
It was not that Yei looked down on Gai, but people with Gai's kind of personality were the easiest to deceive...
Shinnō appeared to be a highly skilled doctor. If he had deliberately approached Might Dai, seen the injuries on his body, and then hypocritically said that in order to better help him recover from the lingering damage to his body, he needed to know his secret technique so he could provide targeted treatment, then with Might Dai's personality, he would surely have thanked him profusely before presenting the cultivation method of the Eight Gates Formation with both hands...
That would explain how Shinnō had obtained the Eight Gates Formation...
Countless thoughts flashed through