Did you see Jaworski play? I would take him over more than half the QBs playing today. Probably better than all but the top 5 today. I think you can know a lot about the game without being great at the game. I pitched baseball for much longer than most people play the game and although I did not play professionally I can tell you what pitch a guy is going to throw and where he is going to throw it with about 95% accuracy. You don't have to have been a great player to understand the game, that is why the greatest managers and coaches are guys who studied the game and they are not usually great players, very rarely are great players good students of any game.