Board Thread:Naruto Discussions/@comment-25498180-20141004140328/@comment-4688597-20141004143002

Actually it's implied that only uchiha that gain the Six paths chakra obtain the rinnegan. This is because Naruto got the same chakra, but not the rinnegan. The rinnegan is the height of power for those who have the "Eyes of the Sage" (A.K.A, the Uchiha). The SPSt is the height of power for those who have the "Body of the Sage" (A.K.A, the Senju).