Just saw spoilers. Convenience, the Arc
! Source: http://onepiece-naruto.com/blog-entry-1139.html
Credits: Mattaku\Doumo
Very brief summary since I'm busy:
Gerald explains his power to Kenpachi, saying it's to give concrete form to the imagination of the masses.
Ken says he will regret explaining his power.
He gets up and tries to cut him in the face avoiding his sword.
Gerald slams him in a building.
They both praise each other for being quick.
Toshirou and Byakuya try to do something combining their bankais, but Gerald immediately discovers them and comments on him being the supreme warrior and them being worthless against him.
Yachiru appears near Kenpachi and tells him to raise and finish the fight.
She says: "If you use me in the right way, there's nothing you can't cut."
She touches his arm and it becomes wrapped in reiatsu.
Kenpachi: " what's this power?"
She tells him: "It's called Bankai."