User blog comment:Salubri/Final Fight: Reflections of an Unrealistic and Ridiculous Battle/@comment-44061-20100211221827

Well they have pretty much stated only Tosen was immune he was blind. Yamamoto's got a fire-zanpakuto and it stands to reason if it doesn't do enough in shikai bankai wont make much difference. Aizen's zanpakuto is based on sight allowing control of the 5 senses via illusions. So we dont know if they can. But we do know Urahara was at least affected by the affect and we do know it lasts apparently forever. 100 years later the Vizard are still affected. Hence my issue with it, no time limit or nothing to its effect. Aizen even states that it needs only one time to witness it in order to work. The problem is that Illusions are problematic to get around, there is little affective counters to it.

I think we have worked out even if Ryuken hasn't seen Aizen's zanpakuto he isn't a threat. As for Ichigo theres really no excuse he would have had how much intel on who he had to face and he knows who the shinigami traitors are he was there when they left, if he didn't question the action he probably wouldnt have said anything but he did though it was a pointless gesture. I doubt that this issue wont be resolved at least not in a way thats believable.