I don't think it makes a difference.
If you think about it, Brody landed more significant close quarters hits on a superduper Predator than Arnold did on the Jungle hunter, Arnold was just running away. The people who managed to kill a Predator in a 1v1 fight weren't buff guys; Harrigan, Brody, the Yakuza guy, with close range weapons, then there's Billy who didn't last a second
. Dutch beat him because he was smart, not because he was buff.
My point is; I don't think a muscle dude represents a bigger threat to a Pred than a slender dude.
I'd be more scared if Medellín was after me than if it was Dutch.
Sure it makes a cool look though.