True as well, but Sasuke is a genius and you've seen how quickly he's mastered the Mangekyou, Madara also didn't have much time to master the rinnegan but he can bring down freakin meteors, it also really depends on when Naruto and Sasuke do end up fighting, cause I can tell you this, Naruto is probably going to be near death by the end of this war and Sasuke will also end up being exhausted.true but Sasuke would be nowhere near Nagato's level with the Rinnegan since Nagato had the Rinnegan for almost his whole life, while Sasuke would only have it for a little while with no prior knowledge to it