"Naruto's family gave him a stronger ability than Sasuke's family ... But it's still 4-1"
Try not to forget that .
Plot demanded it and it's not like Sasuke didn't have Orochimaru curse and it's not like Naruto was not nerfed by Kurama.
1. Their first fight was on the rooftop of that building where Naruto was about to kill Sasuke if they had clashed. Safely, Kakashi stopped the fight.
2. At the valley fight Naruto had Kurama nerf on his abilities while Sasuke had upgraded sharingan and Orochimaru Curse. Seems Sasuke was buffed a lot to match Naruto
3. Naruto never ffought with the intent to kill which is also a huge power restraint. If you would have ever been in a fight and didn't want to hurt someone you would know how much of a power draw back that is.
Stop spouting nonsense. It's pathetic already. You've been rustled for over 5 hours.