Bleach: Traveling through Soi-Fong, Starting from Bankai

After traveling through Soi-Fong, she was infected with the Void Poison and would die without Bankai.
but:
[Mission: Become the Captain]
[Restriction: Until you become the captain, you cannot use Bankai (Note: Forcing Bankai will fail and cause an explosion)]
[Rewards: 1. Reforge the Zanpakutō "Sparrow Bee" and adjust its abilities; 2. Master Bankai. ]
Broken Bee: I want to be the captain.
Yamamoto: You need to learn Bankai first.
Soi Fong: I will only be able to use Bankai if I become the captain!
Yamamoto: Then learn Bankai first and then become the captain!
SoiFong (throwing a chair and roaring): I've already told you that I won't be able to use Bankai unless I become the captain!
Yamamoto (sticking his head out and cursing): Then go! Learn! Damn! Bankai!!
Soi-Feng: Yamamoto! I fuck you, Sage!
Soi Fong: No, I have to think of a way, otherwise I will die.
the next day.
Yamamoto: This is a captain's meeting. What are you doing here?
Soi Fong: Captain of the 11th Division, Kenpachi the Bee! I am here to serve!