Board Thread:Theories and Speculation/@comment-25093611-20160221130833/@comment-9782468-20160222191513

And Naruto randomly started making gigantic Rasenshurikens that didn't take up too much chakra even when he could barely use three per Sage Mode before, and he did so without a cloak.

It's not the Avatar/Susanoo, it's just that their reserves grew to allow them to scale their techniques up