Board Thread:Versus Debates/@comment-27664103-20160220225016/@comment-26388300-20160224174332

Obito is, theoretically speaking, untouchable with both MS. A single landed blow from Kamui Shuriken would essentially paralyze or defeat Madara. Any landed blows on Madara's part would phase through Obito, leaving him undamanged.

Madara's only option is to use his enormous chakra reserves to outlast Obito, which is something I am confident he is capable of. Summon a small army of Susanoo wood clones to act as shields and otherwise to guard against Kamui, or summon a meteor to appear when Obito's chakra is reaching is lowest points. Ultimately, Obito would have to bring about a deathblow early on in order to win, and I suspect Madara is capable of evading that until the opportune time.