Board Thread:Theories and Speculation/@comment-29332822-20170111104029/@comment-734582-20170114130831

Naruto's not rusty, it was just Kurama being sassy as usual. Keep in mind he's virtually a god: he defeated Shin kids just with Kurama's strong aura, took a blade to the gut and walked away like it was nothing. Naruto Gaiden is the story of Naruto taking an afternoon stroll, defeating some enemies along the way.

Kurama's "rusty" statement was that he was taking the fight too easy, since it should be shinobi 101 by now that any ninja with Sharingan is worth your full attention and any shinobi with Mangekyou will have strange and unknown powers that require 100% seriousness regardless of your skill and power. But Naruto and Sasuke acted like any fan on a versus debate "stomping/blitzing/easy". They forgot a Mangekyou is still a really powerful eye