Board Thread:Naruto Discussions/@comment-26488946-20150612205152/@comment-1251315-20150612213756

Nagato was nothing more than a pawn for Madara's future plans. They are not his eyes, so he can't use them properly as a result. Just like how Kakashi's Sharingan was a transplant and consumed chakra. I guess that Madara decided that Nagato was the most suited to carry out his plans.

Also, Rinnegan does not give Sharingan powers, so I don't know why you think he does. Had Nagato legitimately unlocked the Rinnegan himself, rather than having someone else's eyes, we probably wouldn't be having this discussion ;)