I think they'll fight at the valley again. It'll be just like in part 1 and naruto will keep talking during the fight about everything that has happened in part 2. Then they go for another clash, although a much greater one, and Naruto scratches his forehead protector. That will just make Sasuke break down and give up. I know it is pretty much exactly like their last fight but thats my theory. I think the nostalgia factor of it is why it makes sense to me.
I guess that is true but Sasuke>Naruto and Kakashi now....
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Sasuke > Kakashi but Naruto > Sasuke IMO.
Looking at Naruto's new abilities now that he's friendly with kurama I really don't see how Sasuke is going to beat him. He can use KM and SM clones all day each of which are pretty powerful on their own. His clones can use bijuu-dama, rasenshuriken....