One big difference is that a good manager can take an average team and build a good team over time. If you can't do that, you aren't a good manager. A manager

One big difference is that a good manager can take an average team and build a good team over time. If you can't do that, you aren't a good manager. A manager that can't tell who on their team is good will (in the long run) take an average team and turn it into a bad team.