I thought this way to. However, the image of the sage that we saw is similar to the image we get of Nagato when his chakra is controlling someone. Nagato could give the rinnegan that way to his bodies, so I think that's why he'll get the rinnegan.I don't think Naruto will get Rinnegan, but I do like the idea of him becoming a 2nd 10-tails. That match up would be awesome.
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See why I'm making that connection?