I honestly think it will end up being naruto and sasuke, I'm not by any means a sasuke fan but if they want him to end up back in the good graces of the ninja world that's the only way it could happen. If he helps naruto take out Madara he will be accepted again. I think bee will be captured leaving naruto alone then at the last second sasuke will come help and they will win. Leaving naruto as the last jinchuryki and sasuke good again... Finally
Neither naruto or sasuke alone could take him on and win. I believe that after the naruto vs sasuke fight. They would become friends again and both will tag team against madara. This is the only real chance they have of winning