Just a thought, but do you guys think that Sasuke could have had a legitimate chance to awaken the Rinnegan?... I mean he is an Uchiha who has awakend the EMS, and he had 6 Zetsus in his body all containing senju DNA.
Do you think Tobi planned it that way too, Because im pretty sure that Madra had told him what was needed to awaken the Rinnegan, and Sasuke didn't have any idea that the Zetsu were inside of him until recently