Board Thread:Naruto Discussions/@comment-32104334-20171109032930/@comment-734582-20171111135946

Ahya07 wrote: @killman actually itachi allowed sasuke to break out of Tsukiyomi. He couldn't kill him inside the genjutsu because itachi wanted to remove the curse mark from sasuke. This proves that normal sharingaan cannot break out of tsukiyomi. No. Itachi outright stated that only a true Sharingan user can break it, IE an Uchiha (or even more specifically, Sasuke). It wasn't watered down.

Besides, the Sharingan can analyze jutsu even retroactively, and decode how they work. Against Itachi it is, if i counter correctly, the 3rd time he gets hit. He had plenty of time to analyze how it works.