Board Thread:Theories and Speculation/@comment-28939725-20161201164545/@comment-25122992-20161205195137

We don't even know what Nagato has done to these shinobi to kill them. Either way, he fainted each time he used Rinnegan that way and didn't even remember what happened. Obito battled almost non-stop after clashing with Naruto, he couldn't allow something like this for himself. Also, Kamui was still a nice option which made Obito's right MS worth to spare.