Board Thread:Naruto Discussions/@comment-25139119-20140722023329/@comment-25210534-20140722094131

Although the Rinnegan Nagato came back with may not have been his because all of the Jinchuriki had a Sharingan and a Rinnegan so he may have had a way to clone them. Although I would not be surprised if Nagato had also awakened his own. Even if he didn't have his own he could definitely use it due to his immense chakra reserves as an Uzumaki like you said.