At that point, even if all of the units were still alive and gathered together, we'd only have 3 Warriors and 2 Scouts. If a strength 16 Eidolon or a strength 14 Manticore pops out of the Lair the game will end abruptly.
That COULD happen but the rush of barbs COULD also get lucky and destroy your first city. Or they could slow you down big time. I think that seeing how unlikely popping a megadeath monster out of that lair is, I'd get rid of it.