I don't care how long naruto has had it or how hard the struggle was to live with it, it's not his. It's borrowed power independent of a clan or KKG. It's not his. Never will be.
This^ if you can't accept facts gtfo, we don't need you. Sasuke base solo's with no diff.
He's always had speed before he unlocked his sharingan, enough speed to beat naruto at least. Confirmed when he almost took the bell from Kakashi in part 1.
It took Naruto years to just to trick kakashi with a stupid book. With that, he still hasn't passed the test...any of his tests.
Written exam
Kakashi bell test
chuunin exams
become hokage (goals as well)
get sasuke back
master the complete version of sage mode (not the one he has now...its another one that's way more powerful)
The WSRS without sage mode
hell even an individual hand rasengan...even when in BSM he can't..still needs extra hands.
Based on all this...its foreshadowed that Naruto isn't going to complete his dream and goal.