Board Thread:Naruto Discussions/@comment-26993711-20160319001508/@comment-25122992-20160319180739

Izanagi theory still has this flaw - Obito said he kept some things secret from Itachi, which actually allowed him to survive back then, but Itachi was pretty knowledgeable about the kinjutsu of Uchiha, especially Izanagi/Izanami and their history, we know it for sure thanks to the battle against Kabuto and the aftermatch. It's hard to imagine Itachi wasn't able to foresee the possibility of "Madada", the legendary leader and the most powerful Uchiha in history, having mastered the Izanagi technique. That's why for me Kamui theory seems more plausible - Izanagi's limits were already explored and descriped, and Itachi was familiar with them, but Kamui was Obito's personal jutsu only he possessed. OK, Itachi is smart, but he's not omniscient. He wasn't even aware of Obito learning the truth about him, and he truly believed Tobi was Madara all the way.