Two counter punchers and it could make for a boring fight. But I think DeJesus presses the action and he's able to counter the counter puncher here pretty well. He's faster, more accurate with his punches(Especially the left hook), and he has more power than Casamayor. I think he takes him to school. DeJesus via wide UD.
I think DeJesus would only engage in strict countepunching for a short while before deciding that he simply does not respect Casamayor's punch... DeJesus could get in there and pressure a guy with the best of them and I think he'd do that to Casamayor and basically chase him out of the ring, continually work to Casamayor's right and pound him with the hook to the body and the head whenever the chance arises... DeJesus one-sided decision, maybe even a stop if he has the extra three rounds to pile on the punishment