Pogba, Rashford, Lukaku, Martial and possibly Lingard all have egos and are the biggest players in this team. The problem is they're not performing anywhere near players from the teams you listed. I don't think that's entirely the issue though, i think it's a distinct lack of effort. Even in this terrible run, nobody watches our games and feels like the players genuinely care or are leaving it all on the pitch to try and push us over the line. There's a whole variety of problems with this team.