Unable... Oh boy. I know that Kuukaku's got the same problem. I was just chalking it up to inexperience on her part, though. And I thought mine wouldn't return because... well, it's a very headstrong thing, that zanpakutou of mine.

But if you can't have your zanpakutou return, Unohana-taichou, then I believe we've got a very serious problem on our hands. Is this happening to a lot of people? And are the zanpakutous saying anything?