Naruto is very powerful right now, even madara is surprised at how well he is controlling kurama's chakra. If there are anyone able to stand a chance against madara it's either Naruto or Sasuke after he gets the scroll. And i think it's safe to say that naruto will become the strongest soon. I see madara almost killing naruto and then when it all seems lost, naruto will get a powerup that is HUGE.