I see a related topic to my question appeared recently as well, but this is hopefully distinct enough for its own thread, since it's kind of the converse issue.
My group was fighting two squads of cannon fodder in the last session, 2 and 3 minions respectively. The one squad had 2 wounds against the remaining minions, and the other had 3 (against a wound threshold of 4). Due to some maneuvering, the boundaries of who was in each squad got blurry as they all moved into close proximity.
So my question: what happens if I merge the squads in an effort to improve their attacks? If the wounds also merge, then another goon dies since you only track pooled hit points and there would be 5 against the pool.
I'm guessing there's arguments to be made that the squads should stay discrete since they were only trained to fight as part of their own particular group, but that seems hokey, especially if there were a leader present to direct their efforts.