Thats Blaze Release for u..All he needs is his 3 Parts Justu which in this case will be sasunoo,Amatersori & the tysoyomi that sasuke doesn't haveU_U..
If Sasuke is stronger than Naruto it means that Naruto still needs to go back to training but as i can see jiraya is dead,minato gone kakashi can't teach him anything again,even the toads are done,they is no one to train him.meaning Naruto has passed through the stroy line of training to get stronger...
Sasuke is just useless against Naruto but kishi will make it look like they are equal so that it will match the story line but with their powers Naruto is stronger...Sasuke is not as smart as fanoys make him sound if he was smart he would have waited for danzo after the Kage meeting,Not to go in as if he can beat all the kages

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This is pointless in Dragon balls came out Goku was the main char so he is stronger than other char....in bleach Ichigo is the main char & just like Naruto he got stronger...No movie,cartoon,manga or anime will have a main char & he or she will not be the strongest at the end of the show...As far as i can tell Naruto is coming to an End & as it Ends sasuke will see the difference in their powers just like vegeta didU_U