Congrats on your fatherhood! laugh
Does following the leader mean only one entity searches for a full path and the others only do close-range pathfinding? If so, what happens when there's small places that they need to get through, does the leader take into account that there's more entities than just him trying to get through?
Looking forward to seeing the changes in motion!

Speaking of follow-the-leader: Have you tried what happens when one entity is moving around, pathfinding, and another group of entities is set to go to him? Sort of like a moving goal.
This would often be encountered in an RTS situation, when players tell their units to attack a moving unit...

~"I never let school interfere with my education"~
-Mark Twain