I don't need to because all Kakashi did was figure out how to counter Obito's Kamui and the only reason he figured it out was because he had his other eye.
When the Konoha 11 were trying to capture Itachi, Obito was distracting them and their attacks all kept passing through it, it was Sakura that deduced how it worked and told everyone else. Not Kakashi. You re read the manga or watch the anime again