Board Thread:General Discussion/@comment-4161952-20130801170712/@comment-11051098-20130921200730

CoolJazzman wrote: Kaien shikai Kubo found a way to reveal that, even though Kaien was dead and the same with Chojiro bankai aswell

He found a way to reveal those that felt natural, to me at least. Having Aaroniero indirectly devouring Kaien's body and gaining access to his Shikai, and having Driscoll Berci using Chôjirô's Bankai against Yamamoto, both felt like natural development in the story.

I believe Aizen will go for his own goals if he manage to escape Muken. I don't think he will part sides with the SS, since he's already tried to annihilate them once before, but I don't think he will part sides with the Wandenreich either. If he does, it will most likely be to get rid of his enemies in the Gotei 13 and clear the road towards his goals.