Honestly, I don't really expect Manchester United to be fighting for the position they are currently fighting for. With Manchester United's performances last season, I was expecting them to fight for the Premier League title this season, but seriously, they have come so badly this season that they can't even finish in the top four. It is a big shame for Manchester United.
But what I really observed from Manchester United this season was that those players that were in good shape last season, they lose form seriously, like players like Rashford and Martial. I really believe the decline in performances really affects Manchester United this season because they really rely on them, which is why the coach did not get alternative players for their positions.
Yeah. is already late Manchester United to fight for that position in the table because the season is almost end. everyone was expecting Manchester united to start this season with high voltage performance, because they end last season with good performance, I personally was expecting them to fight for the title this season and not what they are doing right now. I was thinking they will be dragging the title with team like Manchester city, Arsenal, and Liverpool, but right now they are even looking to get the top 4th in the table, which is too bad for them and currently with their current status it will be a hard thing for them to achieve they have messed up this season already.
However, those players you mentioned were doing well last season. yes, I believe with that but to me and my own opinion, it is always good to alternative players for team now that these players deform if they have alternative, they would have replaced them or be changing them in their matches, I blame the coach for that, so with this experience I think the coach will find solution to the squad next season.