IMO, United needs a technician and a creator in this position. With Rashford, Hojlund, and Garnacho you've got three speed demons who can run behind the defense. What United really needs are solutions to different kinds of problems, like how to progress the ball through the middle third of the pitch against a midblock and then how to reliably create and score chances once you get to the final third outside of transitional situations. You need a forward who is much more technically secure than the others who can help with ball progression then in the final third can get on the ball, play combinations with others, and generally do something assertive and dangerous when the team is running out of ideas.
Both Antony and Sancho were supposed to be this kind of player. The issue isn't that the profile is wrong, its just that neither is good enough and/or fits PL football well enough.