Ok so we all think sasuke is OP as is, but I u think about it everything is leading up to the final battle of sasuke n Naruto. IMO naruto will acquire the body of the So6p and sasuke will unlock rennigan maybe not for awhile but I believe it will happen.
That being said things could go 1 of 2 ways.
1.) they fight (naruto & sasuke) and naruto defeats him, eventually using talk no jutsu and he has a change of heart and possibly gives him some DNA er go him getting rennigan. Than they team up to destroy (in their eyes) the ultimate evil, which would be tobi and kabuto, if itachi doesn't kill him first Lol!!!
2.) they fight he beats up on sasuke last min he somehow unlocks rennigan and than naruto still beats him jus how he beat pain.