Board Thread:Naruto Discussions/@comment-46954114-20200922072412/@comment-9782468-20200922134355

Not exactly a plothole, Obito knew Kakashi had the eye. and if Kakashi is fast enough to teleport an explosion, Obito would be fast enough to avoid it.

That's not a retcon. Just because Kakashi gained access to MS doesn't mean he was at a level that he could use it. One big fight with the Sharingan put Kakashi in bed for a week, while in Part 2 when he finally used Kamui he'd improved himself to using the Sharingan for the whole day and still could only use it at max three times, collapsing on the third.

Koto and Kamui are pretty different and unrelated in almost every aspect