they have to. Its not used for normal players. The teleport is used to move NPC's from their spawner locations to the location they are visible/shootable on map
if you knew anything about modding, you would understand. The way spawning zombies on cabin fever (for my example, its the easiest to explain) works is you know those 3 zombies under the map? those are the main spawners. Yeah you can kill em and it doesnt do anything but those mark where they spawn, From there they teleport to the top of the map
everything needs a spawner except the main human player spawns, Those are GameStartPoints...