This will be a fight of who is the more conditioned one and no doubt de leon is more blessed in terms of stamina. But if he comes in bad shape and not conditioned enough, he will be surprised, boom boom will definitely hurt and pound him. He has the heart and the will to resist but if his body isn't he may be in deep trouble. But knowing de leon, he will won't come in bad shape thus the fight of toe to toe is ineveitably at hand. Both of this fighter are very hittable, more of a slugger and inclined to fight ruggedly. Experience favors de leon while a little bit of skill favors rb. In conclusion, I think a 100% de leon can definitely beat a 100% RB, but give rb a few more years and the odds will be the other way around.