I've explained it before, it was also outlined when
@NessunDorma posted on this page.
Ultimately, the archetype CF role in the team for Van Gaal was essentially to stand up front and occupy the CB's and barely touch the ball and not get involved. Hence why I made reference to the comments that Van Gaal made in the wake of the Norwich game on the United website. "You see in the games, Marcus is not doing the things he did in his first match or second match anymore." ie. He's breaking from the archetype system "because he is tired". Which in my opinion was an outright dig at the way Rashford was playing (ie. Not the archetype role). I also think that at 6'1" with a larger frame and youthful speed he was more suited to the hold up role than Rooney (who in all my years of watching him has never looked comfortable playing in the same type of role.)
If you want one player in our squad to play the archetype role in both performance and in terms of all-round professionalism then you would look no further than Rooney. If you tell him to drink the kool-aid, he drinks it right up, including standing about up front doing sweet nothing for the first half of the season. This is probably why I am happy to let Mourinho sort him out and I feel comfortable with the feeling of how I think he will use Rooney and I am not particularly worried. I never thought Van Gaal's type of football would work in England, I am not surprised it ended with so few chances created, shots created and ultimately goals scored.
I am happy for a manager who has won the league in this country multiple times recently with a style of football not to dissimilar to Sir Alex Ferguson's to give him one last shot before we get rid of him.