While I would often do that, as I have shown photos of before, there is legit no way you can make a comeback if A. You lost mid. B, you have no mechs. C, can't collect CE fast enough because either oppositions blocks you or you're being bombarded at the door so you have to divert resources to preventing them from destroying your core and D. They have either their tower or both towers well defended you can't destroy them.

Sometimes, all you're doing by fighting is delaying the inevitible, there won't be a change in results no matter how hard you defend. If you can make a comeback, its if the opposition misplays, or you manage to build up the CE for a mech rush.

If it was easier to make a comeback or to break stalemates in this game I wouldn't want to suggest this in the first place.