ElenirLachlagos said:
But wasn't either Kyouraku's or Ukitake's Bankai so devastating that they didn't use it even in a fake town with just captains and vice-captains around? Not sure they'd use it on Soul Society then...
And Urahara's bankai is apparently pretty deadly, too. I hope we get to see at least that one - though they've not been involved in all this at all yet.
Ukitake told Kyouraku that his bankai shouldn't be used with so many people around and Urahara's bankai isn't suited for training, I think we don't know more than this about their bankai. I doubt they wouldn't use it against such strong enemies