Board Thread:Naruto Discussions/@comment-24855911-20140913181717/@comment-3568954-20140928115421

ItachiWasAHero wrote: if that was the case then Madara would not have had to rip out Kakashi's eye to use Kamui and would not have had Black Zetsu use Obito's body to get him out of that dimension. BOOM there goes your argument.

No. the reason he needed Obito's eyes is because Obito has his own dimension when using Kamui if he had tried to use Space time ninjutsu with his Rinnegan he would have just been transported into his own dimension. he needed Obito's eye to get to where Obito was. when Kakashi tried to blast the gado statues eyes out and Obito used kamui to counteract it. Kakashi said "i have never heard of kamui being able to be beat" indicating that Kamui is not a jutsu unique to obito and kakashi and that kakashi must have learned about it and developed kamui. this is backed up by the fact that Kamui has actually two separate powers 1 teleportation and 2 intangibility. these are two separate abilities. which use similar mechanisms. again later when kakashi realized that him and Obito were linked. Guy said" are all space time ninjutsu like this" and kakashi replied with"No i believe it is just us" all of this leads to the conclusion that Kamui is simply another MS technique. and that Madara only needed obito's eye so that 1 he can get directly into Obito's kamui realm and 2 so he doesn't actually have to practice and develop the technique