My gut feeling tells me that Haaland is more of a sponge than MBappe and more willing to learn, feeling that he is less than the finished article. With Pep as a coach, this quality is vital or players feel overwhelmed and struggle with the coach's intensity.
Personally, I would rather draft Delap into the team and continue with a false 9, playing Delap when conditions allow or as an alternative option. I hope that this is one of the key years when the Academy delivers quality to the first-team squad in the shape of Delap, Lavia, McAtee and Palmer, who are all supremely capable at U23 level.