Nice theory on Naruto right hand, but I think you are wrong.
I seen a picture of Naruto in The Last movie, where he is attacking someone with that hand unwrap and the hand is the only part of his body in Kyuubi mode.
My theory is Sasuke win this fight and destroy all the tail beast chakra, including the tail beast chakra within Naruto, but the Hagoromo sun seal will save Naruto and he will still have a very small piece of the tail beast chakra within that hand, for Naruto to tap into (Naruto will be like Kakashi was with the sharingan) and 1 day he will bring them back to life.
Sasuke will kill all the Kages, except for Gaara. ( he will be pardon), setting up Kakashi to become the 6 Hokage (with Naruto only having 1 hand with tail beast chakra, it make sense).
Then Sasuke as the main villain/antihero will have his revolution, that Naruto will lead the ninja world to true peace within, after he gain perspective and his own idea's for the future ( yea Kishi is trolling and trying to have a arc where Naruto not fully depended on tail beast steroids and maybe tap into those Uzumaki powers).