YA guys i dont think that yoruichi will ever fight her zanpaktu an that mark my words the bankai of kisuke is used only once thats why he didnt use it untill now and ishin is banned of some of his power for some reason
but yamamoto,uqitaki and kyoraku is coming back for sure
my only hope is that unohana will use her shikai or bankai although her zanpaktu isnt used as other captains for example there isnt two states for her zanpaktu oh and some of the espada will fight too like grimmjow and starrk and dont forget neliel now thats a cutie ;-)
Did you even consider that she just used it? She has got around her arms and legs some kind of armour which boosts her strength. It isn't said it's her shikai, but the opposite hasn't been either. So you can't say something like that she will never use it so long that hasn't been solved.
And which bankai is only used once

WTH if that would be the case, he couldn't use it anymore from the day he reached bankai ~_~ The only thing we know of it is that it has something to do with blood and that it's not something very convenient in training. My guess is that it powers affect everyone closeby, so that it would be very dangerous not only to enemies but also to allies. Whatever it is saying that he can only use it once makes no sense at all.
And where do you get the idea that Unohana doesn't have two states

...they have only shown her shikai so far and not yet her bankai, just like with Ukitake and Kyoraku. But we know she has it as it has been stated.
If Grimmjow and Starrk are still alive, they're one step away from dying. Especially Starrk as he got diagonally slashed by Kyoraku and his hollow hole was cracking apart

, not to mention that the entire battlefield has been blowing up. And if they were alive, how could they even fight -_-