Why are you so dumb? What does showing any of the elemental natures have anything to do with him being capable of utilizing them? It was stated he can, therefore he can. Your making excuses, and looking pitiful with it.
Comparing the Vanishing Rasengan to the FRS is a joke. That's because Boruto is a 12 year kid and Naruto was 15-16 at that time. Doesn't mean shit when Bolt already pulled off this stunt with half the time, no shadow clones, and did it by himself.
Now gtfo with your logic. Cancerous.
Half those people are dead.
Naruto mastered the Rasengan in a Month, your points suck as usual.