he was starting for us and we didn't let him go because he didn't get a chance ie he wasn't let go because he was shit and neither was Edwards who, presumably, would've gotten a chance but was a dick. These are not what was in contention as one did play and the other would have played but both are out because they are dicks not because they can't play.
And Bentaleb wasn't 'successful'. He played at Schalke and they are not on what was 'our level' in the last 5 years. they are beneath us in profile atm so even if your example was valid the conclusion would still be wrong.
Think harder.