Board Thread:General Discussion/@comment-25265357-20140805135651/@comment-9468724-20140806114006

There is also a great fault to Yamamoto, his pride. That might come into play. He refused Orihimes help in restoring his arm, considering she was a human. Aizen, a very arrogant man who had extremely high aims, recognized her power. This is but an example to the point though. Another might be Yamas use of Hado 96 to fight Aizen. Better destroy him with something tough, but known and used, even if it means to sacrifice his arm, than reveal his Bankai, which would have probably ended Aizen... Of course.. Aizens Bankai is again unknown, so the latter point might not be so valid.