What determines the number of zombies that will be in a zone in the world beyond?
Does killing a zombie while you are in the World Beyond mean that zone will have fewer zombies the next day as well? Does it basically go through and add a random number of zombies to each zone, and all the ones currently there remain?
Also, does killing a zombie in the World Beyond have any impact on the size of the nightly attack, either on that day or on subsequent days? Is there any correlation between the size of the nightly attack and the number of zombies in zones in the World Beyond? Sorry, that's a lot of questions, but I'm sure someone can answer them all.