I will stick to my guns that the encounter system will do everything its meant to, which is sell the player into feeling like the world is teaming with zombies, without spawning guys that just sit there and eat cpu waiting for a player to stumble across them and count against maxalive. Your method (our old method) is careless and wasteful, we're doing something elegant we can control, and keep people at 60fps at all times. ONce the player leaves it despawns and we can send someone else an encounter. We can do mini blood moons in the near future, wandering traders, bandit patrols, wandering hordes, a few zombies eating a corpse, a damsel in distress, all game staged for the person we plan it for.