By the way, Archdevil has another ability – it reduces the luck of enemy units by 1 (I'm not entirely sure), but in any case, I insist on experimenting: I'll do this at home... it's interesting how many Behemoths it will take down in two rounds.
And regarding the rush strategy, I agree, a rush works against any faction if the opponent is focusing on income and leveling up to level 7. However, if a rush versus rush situation occurs, the advantage could be on either side. There's currently a tournament hosted by Adelaide, and you can find interesting reports about duels there. Inferno has participated in it several times...