In a cage match, I think you have to look at the type of fight it’d be. close quarters, not really any place for cover, and a lot of people all in one small area. So naturally, heros that have powers specific to one on one fighting wouldn’t do well, ie Wolverine and yes, even superman(he’ll have a target on his back because he’s the golden boy of comics as well). On the other hand, heros that have a offensive tools with a wide area of effect(explosions, pyscic powers etc) would have a natural advantage. So I think it comes down to only a handful of dark horse picks, The human Torch, Gambit, and Ironman. And I give the edge to Gambit(afterall, he did blow up a planet for christ’s sake)