You say Arthur is a better athlete but he's a fat roidhead, I find Romero's athleticism at 40 years old more impressive.
I also think Jones has a different kind of athleticism more suited to MMA, just cos you can catch and run doesn't mean you're gonna be a beast fighter.
He also beat one of the wrestling GOAT's Cael Sanderson twice in international competition so I don't think there's any disputing Romero being an A level athlete especially looking at him in MMA at nearly 40 years old past his physical prime and he still looks like a superhero.
How many 200lbs+ guys at 40 years old do you know who can flip like this?