I think Manchester United were too hasty in signing Rasmus Højlund from Atalanta, especially as he only had 1 season there with 9 goals and 2 assists in 32 appearances in Serie A. Of course Ten Hag is aware of the talent Rasmus Højlund has as a center forward and he can be developed and become one of the best. However, the problem is, the high level of egoism of other Manchester United players has made it difficult for Rasmus Højlund to find himself in the Premier League.
Rasmus Højlund has so far scored 5 goals in 4 appearances in the Champions League with Manchester United. He hasn't scored a single goal in his 9 Premier League appearances, but if he really gets the support then I'm sure his performance this season will be very good. Just like Haaland, Rasmus Højlund just needs full support to help Manchester United get more goals.
Maybe Erik Ten Hag saw talent while at Atalanta even though it was only 1 season with Atalanta but Erik Ten Hag has seen so far that even with injuries Højlund was signed by Manchester City and I don't doubt Højlund because he seems to have talent at a young age.
That is the selfishness of Manchester United players is still difficult for Erik Ten Hag to overcome even though we have known how other players do the same, but do not know what is in Ten Hag's mindset because he is still difficult to manage the squad that is still surrounded by other player problems such as Jadon Sancho.
I think Erik Ten Hag believes in Rashford more than Højlund, although my own assumption is that Højlund's game is better than the current Rashford, he has a selfishness and wants to control the ball to score but does not think about the chances of other players.