Board Thread:Versus Debates/@comment-26636534-20180830184727/@comment-26636534-20180928161117

@Hag0r0m0

But then you are giving Itachi prep time if you allow him to use Koto. Plus additional prep time for re-programming of koto for combat. You are confused between two instances, the first is the 30% shape-shifting technique Nagato used on Itachi, back when he fought team 7 with Chiyo. The second is when edo Nagato and Itachi fought Bee and Naruto.

In the second instance mentioned above, there is no speed feat for Itachi because, 1) Naruto and Itachi were trying to have a conversation, therefore they are not fighting full out and 2) One dodge from Samehada doesn't make Itachi a speed monster.

The first instance mentioned above showcased a clone shrugging off Itachi's genjutsu and furthermore no indication of a speed feat, since Kakashi was fighting quite fine.

Izumi is not canon, sorry.