Okay vs 1% teams, and like this, you oversize the internal programming of all players. As the simulator have a distance that is covered to simulate arround 60%, if you face a much more lower team, what happens is that all your team is at the max. distance posible, so is the same by the engine a 1* than a 9* and you can know who's better programmed internally.
If he earns a 9-10 probably you can keep him, should be worth. And if gets the MotM then, keep him 100%