The fact that Tsunade attributed significant parity to her prime self with that of Part 1 inexperienced Kabuto implicates that he has to be logically significantly inferior to this incarnate of Kabuto, unless you're of the opinion that 3SWW Hanzo fight Tsunade can't effortlessly physically...
Asuma is physically slower than Kabuto who possesses amplified chakra scalpels that exudes lethally significant damage that could likely trounce him in CQC range especially applying the fact that he lacks the speed features to indefinitely avoid him, and his associated tools, not just that...
Alright, still, how'd he (Asuma) trounce who physically outdid Tsunade, even drawing praise from her in the art of evasive combat, and do keep in mind that Tsunade is literally unrivaled in that facet of battle as exemplified by her own words.
Kabuto wins.
Medical Scalpel Laser Chakra Slash Bisection accompanied with the penetrative wind force clashed & reflected back to deal 2x the penetrative damage ends it.
Additionally he can physically infinitely heal via concentrating Chakra impliciting that he can block approaching assaults...