True, but those months are usually just 4 weeks + 2/3 awkward days
4 weeks per month / 5 main regions of AL (N, S, E, W, Central) = Someone's gonna have to overlap
The problem is that Huntsville has a better scene than Mobile. It doesn't make sense to overlap E, W, or Central because of proximity and you can't have North or South overlap without E, W, and Central having to pick between the two. So attendance will favor whichever has a better scene/tournament.
So basically, it boils down to survival of the fittest