I doubt that Naruto can beat Sasuke even in sage mode cause
a) It lasts for about 5 minutes
b) I doubt Rasen Shuriken can penetrate Susano'o
c) Gogogogogogo genjutsu on Naruto. Remember Naruto can't break out of Tsukyiomi unless the Nine- Tails can disturb the chakra which is what Killerbee did.
d) That settles it. Also I doubt Naruto's heart would be completely into the fight.