A 25 year old RJJ would not be head and shoulders above Dirrell but he would a head above Dirrell. But this is a good comparison. Dirrell is the athletic freak that RJJ once was. Its just that RJJ would be more daring and actually had one punch knockout power. Dirrell will come of age and he will be one of the rare fighters who will learn to dominate on both sides, offense and defense.