The answer is simple. A game manager is a quarterback who isn't going to hurt your team. He can consistently move the ball and with a good running game he can be part of a lethal offense. But he also won't necessarily lead the team to victory on his own accord if other thing go wrong. If the defense is getting gashed and the team is down by 21 points going in to the 4th quarter he probably won't be able to make up the deficit. If the running game gets completely shut down he will be hard pressed to carry the offense on his own. If the team is dealing with injuries at wide receiver or tight end he's probably not going to make the replacements look better than they are.
You can win with a game manager. But you probably need some combination of a great defense, great offensive line, or a great running game.
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