Board Thread:Versus Debates/@comment-29769110-20170730202400/@comment-25122992-20170801114722

@Damcheus, no, it's your sentence that doesn't make sense. The character is known as a user of a certain jutsu only if a) he actually used it in the series b) he was mentioned as its user. Itachi both hasn't used Izanagi and hasn't been called its user. Plus, it was never mentioned that you need to learn Izanagi before learning Izanami.

P.S. Regarding Shisui's eye, you're also forgetting that there's a decade cooldown before Kotoamatsukami and even MS itself can be used again. Itachi mentioned that before his final battle with Sasuke, this cooldown hasn't passed yet, so in this state it's just a usual Sharingan, not even an MS.