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Yeah, Naruto passed Sasuke in terms of raw power and in terms of defense and probably also in terms of speed - with the Rikkudou Cloak. In sage mode, a battle between the two is a cross-up provided Sage Chakra protects against genjutsu. Base Naruto vs. EMS Uchiha Sasuke is a no-contest.
We don't know when we will next see Naruto or Sasuke. I predict that Sasuke is going to be able to use Raikage's lightning-armor technique and possess greatly enhanced perceptive and illusionary abilities+one new EMS technique. This technique that Naruto is learning seems like a practical technique more for killing Kabuto than Madara.
Good observation. I guessing that only an Uchiha can defeat and Uchiha. That aside given how Sasuke tends to bite the hand that feeds him, he'll be the one to take down Madara anyway. Sasuke will more than likely take down Madara while Naruto takes down Orochi-Kabuto, leaving the final battle between two former friends.