User blog comment:Yoruichigoddessflashes/Ichigo, the Savior/@comment-1268838-20100805194432

The problem is, everybody is looking at Ichigo's abilities, but not at his character, which is the most important thing here. From day one it's been clear that Ichigo has a ridiculous amount of spiritual energy, yet he has never shown any signs of being aware that it fluctuates, or that he has more than twice the amount of a captain. He doesn't know this, so he has been unable to tap into his full power - as Yoruichi said, Ichigo relies on instinct. He has the power to defeat Aizen, but he needs to bring it out; that's what his fight with his inner "power" is all about. Throughout Bleach, Ichigo's been constantly plagued by his fear and despair, and now this hopelessness that is so deep, that it has completely changed his inner world. Ichigo was not emotionally ready to face Aizen, but now, he has had 2000 hours to get over it. Ichigo has never killed anybody before, but that is only because he has wanted to prove a point (Byakuya), or because he has taken pity on those he has defeated (Dordonii, Grimmjow). He has absolutely no reason to do either with Aizen. The point being, the power boost that Ichigo is going to get will be more than believeable.