Stretching the blob to allow for massive battles

[Hoofhurr]

Generally players form zergs because that's the easiest solution to winning a fight. Got pushed out of an area? Get more players. They also form zergs however because players generally want to be where the action is and where they feel like they are contributing.

Splitting up the zerg however has solutions that can be borrowed from any strategy game. The penalties for concentrating your force in one place is that this usually leaves other locations undefended.