Exactly , they are forwards forced to play on the wings , because of united's board bad squad planning and management. He wanted perisic for that. Also not getting mane was a huge mistake. Jose has played a 352 and 3412 in big games and put martial and rashford up front when the balance allows them to play that way, but when not the wingers have to play the dual role as we dont control posession all the time. Park was a big game player for us and played all the big games for the very same thing he brought us in those games while ronaldo was played as a striker. When those forwards have to play on the wings for the balance of the team in big games , the'll need to do everything there needs to be done for mourinho's philosophy. Even sir alex would never allow wingers like ronaldo to stop doing defensive duties if he has low quality full backs behind them. But most of big clubs play 3 at the back in epl and we set up the same in those games where rashford and martial dont have defensive duties. City and liverpool dont and thus when we play against them they will need to learn those dark arts as well.