User blog comment:Rejuvenation/New theory/@comment-44061-20100207223806

Unfortunately if you actually looked over that again you will find that Hitsugaya never promised her anything along those lines. In fact he never answered her and was actually pissed off even more at what Aizen had done to her mentally and emotionally. So his intention to kill Aizen is very real, now whether he has is the question. Significantly injured sure (characters in bleach take alot of punishment, except when they are being finished off) But Aizen has a little bit more to go before he goes down for good. I think we can rule out the thought of it not being Aizen as if it wasnt the power he used to fight and then the shock of actually being attacked being exhibiting wouldnt have been a factor. Secondly as far as Aizen - Gin swap also least we forget we have seen far less from Gin then we have seen from Aizen so its not likely and once again Momo was in a unstable emotional and mental state. She was coming up with any scenario to take blame off of Aizen, she is not credible in this regard least you forget what Aizen told Hitsugaya in the SS arc. He mentally manipulated her to the point that she cant live without him (thus her unwillingness to see him for what he is, though also Aizen over estimating his psychological power over someone, she'll get over it as people do in such situations). As for your last theory it possess a fundamental flaw. Zanpakuto work on simple system. Shikai and bankai. The bankai is only the spirit coming into the physical world. As more advanced version of the shikai. Aizen's zanpakuto is hypnotism via sight, thus allowing him to manipulate the perception of the senses by creating illusions. The creation of life is an aspect of biology/physics/chemistry and not mental manipulation so that would not be likely but down right impossible. But as you have noted its highly unlikely. Also the Espada weren't disappointing they fulfilled a role, they were never meant to last, they were put out as cannon fodder by Aizen against a greater force, one Aizen knew full well their capability. Blame him for their fall but there is no coming back.