Board Thread:General Discussion/@comment-27140233-20151102183905/@comment-26091912-20151103233347

What's all the fuss about?

A Bankai either fuses to/surrounds the wielders' body, or it takes the form of some being which resembles (or in the case of Kyoraku, is) their Zanpakuto spirit which they are linked with. The exception being Gin and Byakuya. There's no contesting that. And Bankais have changed appearance on more than one occasion, for whatever reason.

Yes, these theories are flawed, and yes, this is just speculation, but the conclusions are still entirely plausible. There's no need to nitpick over something so trivial.