Nice fanfic..KCM Naruto Mastered Mode defiantly steals the win.
He has access to Kyūbi 100% Chakra-pool, and the physical capabilities to encircle Ay-III, and physically manifest a SCOR, or COFRS on the rear of Ay-III. However, the emaciating traits of ET gotta be accounted for, or factored explicitly.
I'd say the mix'd be reminiscent of the former grabbing the V w/ like extreme mid-high difficulty.