Madara used Kakashi's eye to get into Obito's dimension. But if he plans on replacing that eye with his rinnegan, how is he gonna get back out? Unless he can use kamui with that rinnegan, which I doubt.
Re: How will Madara get out of Kamui Dimension?
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Madara can teleport out of kamui with kakashi's sharingan :|What the heck did this prove?