OP is an idiot. Full intelligence on itachis genjutsu never stopped him from still landing genjutsu on top tier opponents. Plus Bee IC is straightforward and headstrong, fighting cautiously and avoiding itachis genjutsu? If you say so. All itachi needs is a reality simulation genjutsu, and if the Hachibi doesn't break bee out in time, he gets one-shotted by Amaterasu, a shunsin blitz, or itachi covers the distance and gets tsukyomid. Yes I believe tsukyomi works on bee, well itachis tsukyomi at least.