Board Thread:Theories and Speculation/@comment-1512913-20150221101637/@comment-25549954-20150307105312

Kabuto experimented on Hashirama cell and he injected those cells to heal Sasuke, with Hashirama cells its highly possible that he received healing ability but we can't say for certain that he has wood release, Hashirama also gave him chakra and a jutsu to counter Madara's Senjutsu but it rebounded on himself probably. I don't think Sasuke's Rinnegan always remain activated he could probably switch it with normal Uchiha black just like his Sharingan, Nagato couldn't deactivate it because it wasn't his eyes and Madara could switch it with his Mangekyou. I think he got his Rinnegan because of Hashirama's chakra and his Indra chakra got mixed. And that is why he was probably able to meet the Sage to receive tattoo gifts. So I think his Rinnegan is permanent only the tattoo disappeared, but in The Last and Epilogue his Rinnegan was not shown for whatever reason.

Naruto probably lost his Six Paths Chakra during the explosion created by Toneri, Naruto's chakra and two orbs which looked like Yin and Yang (similar to shown in prologue) got mixed with Toneri's orb. But I think he'll get it back by lending chakra from all the Beasts, I think it is Kishimoto's way of making them equal Sasuke lost his arm and Naruto lost his Six Paths Sage Mode.