Koeman can't manage... perhaps Lukaku wasn't manageable. He essentially ran Barkley off, and I'm not a big fan of Barkley either. Niasse is willing to perform after being alienated and is not even registered. Not only has he failed to put a team together, and failed with tactics... He can't even manage personnel correctly. He's awful. Having an inability to get your guys to want to play for you is the most telling sign to me of when a manager has failed. I don't like it, because it's very subjective as to when it has happened, but it's something I think is coming if it hasn't already.