Anyone who has remote understanding of the Naruto manga should be able to tell that 'until' is actually inevitable. Putting all the Sasuke hate/Nagato fanboyism aside- I am sure, to some degree, even you know it's going to happen. Trying to dehype Madara using Nagato wasn't a wise move on the Nagato fanboy's behalf, it wouldn't be in Sasuke's case either.That's dumb logic, that's like me saying part 1 Naruto is stronger than hashirama because we know he's the main character. Sasuke has almost no feats with the rinnegan, and until we see otherwise, Nagato easily beats him in terms of feats with rinnegan.