They would never fight they would hold each other in a gentle embarace,, Then look passionatly into each others eyes. A single tear of joy could be scene as they.............. Wait a minute thats just gay.... Joe would drink a redbull, John a good tequilla and they would both dominate the stage.
There is no sure way, unless we could something to arrange the actual fight. I propose Atlantic City, right before their show. This way the last man standing will automaticaly become the first man singing.