Board Thread:Theories and Speculation/@comment-25093611-20160322113057/@comment-28869806-20160323213132

^^^ I don't think giving the Rinnegan to Kakashi is a good idea, it made sense thematically for Madara's Rinnegan to eventually go back to Madara, and besides the Rinnegan would probably drain his chakra much faster than the Sharingan.