User blog comment:Godisme/Deicide 10/@comment-117598-20100618204641

There's probably still soooooo much that Ichigo has to learn about Zangetsu, that TK is taking some time for him to tap into that area. I mean, it's already starting to feel like there is no way Ichigo is going to beat Aizen with just raw power, no matter how much spiritual pressure he has. Ichigo can't control it fully yet, so it keeps fluctuating. Plus he did little to nothing against Aizen before he became a full hollow/shinigami hybrid thingy. He only truly starts to overwhelm his opponents when he loses control and his hollow powers take over.

I still find it hard to believe that this new technique, with the little experience he's going to have with it, is going to be the end-all-be-all attack that finishes Aizen.