Board Thread:Theories and Speculation/@comment-1512913-20150221101637/@comment-6769189-20150305173321

But again, Sasuke still has the Rinnegan, and in their last fight he took the last of the other Tailed Beast Chakras, so its more likelt that Naruto needed the chakra of all the Tailed Beasts for it. Obito even had some residual 6 Paths Chakra after he lost the beasts. Naruto didnt lose his upgrade, he just couldnt use it.