Board Thread:Naruto Discussions/@comment-26636534-20180325094649/@comment-5085906-20180325133242

Shisui arguably has a better form of genjutsu. But he is not the most powerful genjutsu USER which is what I said. Not to say he may have been, but all we have regarding Shisui comes from the novels and the anime and he was tricked by Danzo in both, so he hasn't exactly lived up to the hype nor has he surpassed Itachi in any shape. And the whole Itachi Shinden feats where Itachi can break down time to a fraction of a second and have someone live an entire life under its effects are non-canon. Cool, but not canon.