Thread:Mangetsu20/@comment-4280197-20140210112210/@comment-2089817-20140211062220

Ichigo was never under Kyoka Suigetsu's influence. Just having the Shikai activated doesn't mean anything if one does not witness the actual ritual. "Shatter... Kyoka Suigetsu." For someone to fall under its influence, they MUST see this release, it's been stated several times. Ichigo never saw it, thus he was immune to its power and could see past it. Given that Aizen was being pressured by his opponents the entire time he wasn't monolonging about how awesome he is to Ichigo, he never had a chance to put the latter under its influence. And even if he HAD the chance, Ichigo was already warned not to see it, so it's not like he'd instantly fall to it.

Another thing being that in the filler arc, with Ichigo fighting Muramasa (the only reason I'm citing a filler arc for proof is because the Zanpakuto arc was written by Kubo himself, he even said he wished he had time to put it in the manga but never did, but you could still consider this canon information), he was under an illusion and by having Zangetsu serving as his eyes, he could look PAST the illusions which control his five senses, just like how Kyoka Suigetsu does. Now, as I said, this is still technically filler, so you can disregard this, but even so, Ichigo was never under Kyoka Suigetsu and therefore could not fall prey to its effects.

And even if he was, Unohana and Urahara both most likely probably figured out ways to overcome Kyoka Suigetsu's hypnosis, and those two are beyond powerful. Aizen was doomed from the start. And this is all BEFORE he even manages to get to the Soul King Palace, where he would just fight the Royal Guard; all of which I bet were before Aizen's time and I doubt ever saw Kyoka Suigetsu's release ritual.