Board Thread:Versus Debates/@comment-28381997-20160509220110/@comment-25122992-20160510121335

@Pregaiden, Madara had still awakened his Rinnegan prior to meeting Obito. When Madara stated he could take Obito's Sharingan, and the latter asked why did he need it, Madara noticed that his current Sharingan (besides, he has only the left eye back then, no right at all) isn't his own one and that he already gave his original eyes to someone else. After Obito's slaughter with Kiri nins, him coming back and joining Madara's plan, the latter explained that his original eyes became the Rinnegan and he already transplanted them to an Uzumaki child called Nagato.