He is like a waste in the club and he is a selfish player. It was only last two seasons that he played impressively but after that time, he dropped form drastically because he isn't a serious person. United put their hope on the wrong players for transformation of the club and that's why they faced all these drawbacks. They should have sold him since but Ten Hag don't know what he is doing.
Marcus Rashford has contributed greatly to the success of Manchester United. He shouldn't be called a water just because he is having a challenging season. Sometimes players can have one or two bad seasons and pick up later. From my observation, Ruben Amorim is not comfortable with Rashford. The English international will not get the special attention he usually gets under Erik Ten Hag and other coaches. The best option for him is to move to another club.