Maybe the coach is doing some experiment to understand why many good players and even goalkeepers play well in other teams but when they arrive at Manchester United they play worse, but strangely when they leave Manchester United they play well again.
Manchester United has made terrible mistakes in the last 5 years
If you look at the conditions, it does not make sense because when they left and played in other teams it was much better and different from when they played for Manchester United. Making De Gea leave was a big mistake that Manchester United has ever made because previously he was the best goalkeeper who always gave quite satisfactory results in every match from any goalkeeper now. Some media said Manchester United approached De Gea and they intend to bring the goalkeeper back to Old Trafford.