He seems like a solid Coach. I don't think having a memory of every play in existence helps you call a game, coach a team, or make your defense better. It might help you remember certain tendencies, or help with game planning. At the end of the day the players play though, and you can't really control the outcome that much.
McDermotts philosophy is to try to be a leader of men. To get the most out of every player. I hope that daboll can help with some of the game planning on offense, and putting the offense into situations where they can be successful.