User blog comment:AldenHeathcliffe/Chapter 551: The Burnt Offerings/@comment-5147109-20131003173539

It seems to be like the primary purpose of the Bankai stealing ability is that it would be the only possible way to take Yamamoto out of the equation, even if all the other captains get their Bankai back it doesn't change the fact that Yamamoto is now dead and his Bankai is unusable by the Gotei 13, however, it could still be an issue if they can't recover that one.