Board Thread:General Discussion/@comment-24815992-20140730162154/@comment-44061-20140730180140

Trying to make sense of what your saying so here is what i surmise. >1st zanpakuto form is a result of his awakening his shinigami powers (regulated and controlled by his quincy powers) and learning its name. His bankai was achieved by training against the old man (his quincy powers, still regulating his powers) under the watch of yoruichi.

>2nd zanpakuto form is entirely bankai and is a result of his training in the dangai, probably the only time when his powers were honest.

>3rd zanpakuto form is a result of the residual traces of his fullbring changing its look.

>4th zanpakuto form is a result of his coming to terms with his heritage and having a real asauchi as the template for his zanpakuto. This incorporates both his shinigami and quincy powers equally with his full knowledge and understanding.

Whats important to remember is that his quincy powers in the form of the old man was simply controlling the usage of his shinigami powers and not really the power source, its basically the keeper of his powers in a way. The zanpakuto spirit is a melding of his natural shinigami powers and the unique hollow transfered to him by his mother from her infection she received from white. But to your basic question yes there is likely a 4th & final version of his bankai yet to be seen.