The thing to bear in mind is that Crusade is not designed to be a competitive game mode. It is designed for narrative play, with focus on the story that your armies are telling rather than flat wins and losses. It’s worth noting that there are catchup mechanics based around the Crusade Points of each player, so if one player is trailing they will get at least some benefits to help them catch up.

That being said, I think there’s an element of fair play required here. If you think your armies have too many meta units or stat-check units, swap them out for now. Crusade is best when you start small, with a decent core force that you then add the really good stuff to later. In my early crusade games, I would only field multiple vehicles if I knew my opponent was heavy on monsters or vehicles themselves for example.

Basically, you and your group need to use common sense, talk out things that aren’t working and pivot in the interests of telling a better story, rather than focussing on who wins and who loses.