Without knowing any expanded universe stuff from comics or whatever, my idea would be for the predators to be a ruthlessly exploitive species. As in, they're not gonna do their own dirty work, they're gonna enslave some species that is too pathetic to hunt, but not worth genociding.
I'm certainly not the first to imagine a fictional apex species that does this, since it's not far removed from our feudal system history. But it would be cool to maybe hint at that the Predators are through and through a parasite species that enslaves what they won't kill.
the Elois and the Morlochs of H.G wells are supposed to be 2 distinct species evolved from men