STOP TOUCHING MEEEEEEE! no touching of sasuke by naruto....sasuke is gay naruto not. he loves boobies.
A final fight against the two will exclude kyubi. either because sasuke suppress kyubi chakra or because naruto will suppress his anger. unless he learns to harness kyubis power without it leaking but by his own will. I think the leaking of kyubi chakra is based on the will of the demon fox to take over naruto and therefore it can be suppressed. If naruto is consiously able to access the chakra sasuke will not be able to suppress it because he can suppress, maybe controll a bijuu but not the host.
naruto should get his skills up in taijutsu and dealing with genjutsu then he would stand a chance against sasuke. unfortunately narutos heart is not one suited for a shinobi, he cannot kill his emotions. even at the fight pre-shippuuden naruto's intention was just to scratch the headband, not take out sasuke, and taking him back to the village against his will.
he should just kill sasuke for making him run around. the problem as stated previously sasuke has no compunction of killing naruto.