Board Thread:Theories and Speculation/@comment-30241447-20190512072419/@comment-26636534-20190513215646

Well, I mean't access to the full extent. As Madara said, two sharingan/rinnegan brings out the full power of the eyes.

Now that I think about it, Madara could have also performed Rinne Rebirth after his final defeat. He was still conscious, dying, but maybe he could have in his final moments. To try and undo some of the chaos he caused.