Among those at Old Trafford on Sunday was a manager sacked after his side hit rock bottom. No, not Ruben Amorim. Plymouth’s past and present were watching Manchester United, Miron Muslic the day after his side acquitted themselves well at Manchester City, Wayne Rooney pontificating on his old club. Sacked with Argyle bottom of the Championship and possessing the worst defensive record in the country, a man who once said he wanted to manage Everton or United may be an expert on the gap between ambition and reality.