Ruud van Nistelrooy also does not want to be a permanent coach and he said that he came to Man United with only one goal, which is to become an assistant. The point is not whether Nistelrooy is capable or not of becoming a Man United coach, but it was a valuable victory that Man United got because it is something they rarely get this season and it can be an encouragement so that they have hope again to rise from their slump.
Manchester United's first game with Van Nistelrooy was a testament that the former manager of the team was not really capable of handling such elite and dynamic team like the Man U. He has issues with his emotional quotient and he does not really have that stamina to control his players and at the same time boost their morale to make goals for the club. I've said it earlier that the problem of Manchester United doesn't only lies in the hands of the players but the manager. If Ten Hag was able to control that aspect of him, he would have seriously impacted on the club positively through his experience as a manager.