Back then we saw this page, where Kishi wrote :
"That Unrivaled strength. That carefree smiling face. Aiming for HIS level everyone sets off"
For many it was clear what Kishi meant by following :
There were still doubters [and even now there are] even after 502, but this should settle things.
Taking Juubi's Bijju Dama like it was nothing, that too with a Kunai?? Believe me there was no other person who could have done that, Naruto full BM would've lost against it. But protecting everyone with no harm not even to the surroundings [like back then with Hokage faces]
Making an entrance like a boss!