He has the durability, the healing (apparently), the recovery, the physical strenght and AP, his race perks with fire and resistance, can blow himself up and cause huge ass explosions that would have killed Zoro if not for haki protection, Zoro has done little damage so far, capable of overpowering Zoro in general and in CQC, flight and maneuverability. And now Oda gave Zoro the CoC powerup to take this dude out (I think using it consistently).
The thing is, the fight doesn't give the impression of being over really. If King matches it....yeah...LOL...