After Manchester United spent a lot of money in the transfer window this season and they still failed to compete then I believe the manager is the main problem we don't talk about his ability, it's just that sometimes a coach is not suitable for all clubs. I'm sure Amorim doesn't have much time to fix this situation and yeah at least until mid season his fate will be determined. Manchester United have dropped 5 points in their last 2 games and we still have to wait for the next 3 games to say something.
Now the problem is more about the captaincy. If Amorim forces Bruno Fernandez to play in that position, it will make it difficult for him to be as productive as last season. In poor team form, Bruno Fernandez can perform better, providing assists and scoring goals, and forcing Bruno Fernandez to play the way he did in the previous two matches will limit his creativity on the pitch. Things haven't gone well, but if Amorim continues to experiment and keeps Sesko on the bench for longer, it will make things much more difficult for Manchester United.