Dan Reeves was his coach most of his career, he must have been doing something right if he got Denver to 3 Super Bowls and had a 600% winning percentage with them during his tenure. Don't forget that during those first three Super Bowls they did have a good defense, one of the top ranked in 89 and one of the top offenses as well that year. You brought up what if's first with assumptions that players in the past would be awful if they played today. There is no way of knowing that so basically it's a WHAT IF. It's subjective, because you are going with the assumption that the player wouldn't attempt to adapt to the current game.