Board Thread:General Discussion/@comment-4976518-20140808063123/@comment-26912075-20180108001912

There is also a theory I've heard bounced around that his blade is beyond a Bankai state. Proponents of this theory argue that Aizen had already reached the ascended state where his Zanpakuto was fused with his very hand similar to Dangai Ichigo. Then they argue that Aizen's zanpakuto fused with his very being makes it inherently different and superior to whatever Bankai Aizen could have had. I don't necessarily believe this myself, I just want to throw out that this is a theory some have.