They tend to fall into two different categories.
First you have the master motivators who get the most out of their players on every play. They instill toughness, discipline, and a championship mentality. Lombardi, Shula, Tom Coughlin, etc.
Second you have the master innovators who introduce things like the forward pass, the zone defense, the west coast offense, the zone blitz, the spread, etc. Coryell, Walsh, Paul Brown, etc.
This is tough.
I’d say the best coach for a team would be Belichick.
But he hasn’t changed the game the way Walsh did. Look at what Walsh did and look at what all his assistants did running that same offense with other teams. He’s the father of the dink and dunk offenses we have been seeing over the last 35-40 years.
Alex.