Chapter 47 - 047: Battle Against Kyoraku Shunsui
Back then, Kuchiki Koga cast Bankai, but still was defeated by Mazuru.
Although that incident does not necessarily prove that Mazuru has the combat power of the captain level, it may also be that Kuchiki Koga's Zanpakuto was restrained by Mazuru's Zanpakuto.
Captain Yamamoto also learned some information about Kuchiki Koga's Zanpakuto from Kuchiki Ginrei.
After Bankai, Koga suffered the backlash of an unknown force and lost directly before even showing the true power of his Zanpakuto, which seemed really incredible.
Since then, Mazuru has also entered the eyes of the head-captain.
It was just because there was no vacancy for the captain of the Gotei 13 at that time, even if the captain of the Twelfth Division Hikifune Kiryu was promoted, he quickly found someone to fill the vacancy.
Mazuru was only remembered by him after that.
In Captain Yamamoto's life, he has seen strong men and geniuses like crucian carp crossing the river. Even if Mazuru has the strength of the captain level, he is not worthy of his attention.
Until this time Seireitei encountered unprecedented changes.
Out of thirteen captains, six at the same time left.
Mazuru, the spare tire, was only remembered by Captain Yamamoto at this time.