Board Thread:Naruto Discussions/@comment-25442710-20140920121351/@comment-26302001-20141003150952

then again Sasuke already had Asura chakra and hashi dna from hashi and kabuto before hagoromo gave him chakra, madara said that only when he was near death did the rinnegan awaken, and then he connected himself to the mazo to live longer. So maybe Sasuke awakened his Rinnegan when he was about to die and THEN hagoromo gave him half his power which turned it into the one-eyed Rinnegan. If Naruto ends up near death in this fight, that is when we will see if he will truly get Rinnegan or not.