Board Thread:Improvements and Issues/@comment-4930269-20130614003800/@comment-11051098-20130622012327

It is a bit confusing. From the way Kensei spoke to Shûhei regarding Bankai, it seems he's trying to make him achieve it. But it could also seem as if he's trying to make Shûhei earn to master Bankai which he has already achieved.

But I understood it like he has yet to achieve it. But "not yet revealed" could be because it seems he will, if he has not achieved it, actually do achieve it soon.