Re: Who's deadlier with 3T sharingan, sasuke, itachi or kakashi
@Kidgamer Do you realize how Sasuke doesn't call his MS tsukuyomi by this term, and only uses the term MS genjutsu? It's because the manga wants to highlight Itachi's as it surpasses the actual MS genjutsu. Otherwise, it's obvious that even Sasuke has it, and so does Madara otherwise they wouldn't have a sussano, now would they?
His Kamui is a special jutsu which doesn't seem to be linked to Uchiha at all. It's something he himself awoke when he went through a life and death struggle and was kept in a limbo-like existence. Also, he awoke it when he was hit by a rock, as according to Madara, he slipped through most of it: http://www.mangapanda.com/naruto/602/5. As he of course was in a purgatory-state, where he was neither alive nor dead.
This is an ability independent of the MS eyes. Hence it shouldn't pose any threat to his eye-sight that would drain IF he uses the original kaleidoscope techniques.
Also, according to Zetsu, only Madara was capable enough to cast the genjutsu, which could explain Tobi's interest in Sasuke as he wanted him to awake his EMS as well: http://www.mangapanda.com/naruto/603/8
Syncing with the mezo alone gives enough chakra to avoid death: http://www.mangapanda.com/naruto/602/14. Now how would that gutsu continue to work without constantly using the technique? You think one reflection would cast cast the jutsu for eternity?