User blog comment:Godisme/Deicide 21/@comment-1268838-20100909174446/@comment-44061-20100909175130

That brings up my point exactly he claimed that he had subdued the hogyoku and was its true master yet he doesn't seem to control it at all. It transforms him when "it" chooses how "it" choose to. He has no control over whether it will allow him to loose or win. It seems to running out of potent transformations as the battle goes on. All transformations have been at its whim not Aizen's.