since when does Itachi have kage level speed? he has never shown having some high speed, the only time was when sasuke was under a genjutsu, which was probably just an illusion.LOL. how is itachi faster? I know you aren't comparing part 1 chuunin exam speed to part 2 kage level speed now are you?....Sasuke has a bigger jutsu pool? sigh ........ The boy who has been in anbu since 11 , with sharingan who had more opportunities to copy jutsu than sasuke has a smaller jutsu pool? Ems nullifies nothing.... Genjutsu will still work on sasuke....
-You'r just assuming that Itachi knows a bunch of jutsus from his sharingan, that claim has no proof
-Yes the sharingan gives the user protection from genjutsu, the higher the level-the more resistance. Zetsu even implied that MS can fight Tsukiyomi.