User blog comment:Xilinoc/Ch. 684 - The Blade/@comment-24769684-20160728121813/@comment-11293956-20160728154416

Since Kyoka Suigetsu alters one's perception, I see no reason why it can't effect something like The Almighty (which is a perceptive ability). I think it was Sun that gave an explanation of why it worked during last week's podcast (Aizen absorbed Kyoka Suigetsu's powers when the physical zanpakuto dissappeared. While on one hand he doesn't need to show the release to hypnotize people, he can't control what they see and his illusions are cast onto himself). To me, that seems like the most reasonable explanation.