I like Melvin's phyqisue A LOT, but I think he is closer to hitting his stride (peak) than Dennis, Victor or Phil. Darreem looks GREAT but will never have the size or height (and HEIGHT is such a KEY factor) to be Olympia or Arnold Classic Champ.
With Heath and Wolf I see lots of room to continue improving, Victor somewhat too, though I wonder about his ability to nail conditioning time and again.