Just like McNabb is a better athlete than Favre. But Favre is a better overall player.
What separates Dan from any other football player (and why he should be tops on any football list) was his force of will. Sure he had the quickest release, the uncanny accuracy, the great decision making, but it was his force of will. That intangible that he had - a presence that I haven't seen with any other player ever. Elway had a cannon for an arm and was a good QB, but Marino was the undeniable leader. It was his game every game he played in. Everyone who had the pleasure of watching Dan over his career knows what I'm talking about. It was a different element involved when Dan was under center. A command.