When Amad returns to United in the summer, then Ten Hag will have a good idea if he has the skills required to actually add something to the squad during pre season training and matches.
It will be interesting to see if he plays him wide right (I think that is where he will initially start in the team), or as a 10 type of player.
I have complete faith in Ten Hag to make the right decision on Amad's immediate future, whether that be with United, or another season on loan, possibly to a premier club, similarly with Hannibal, Laird and Fernandez, who had decent loans so far.