In a 4 man situation the tank always sets the pace as the tank sets the pace based off their own skill and after the initial pull.
In any 4 man dungeon you can determine the quality of dps and the quality of heals. If the quality is low the tank will change the pace and vice versa. But ultimately if the tank is pulling one set at a time. Good dps and a good healer, it does not matter the dungeon will still get cleared in a decent time.
