I did say it was likely, if anyone bothered to read my posts. Certain, no, but maybe about 80% or so. It's too unbalancing to do anything else.
You want the zombie population to be more or less a representative sample of the roster. So, a third of players are baddies ----> a third of zombies baddies. I assume, as well, although I cannot know because johho hasn't put the pack names in the first page or on the winning post, but I assume that Brown Demon was probably attached to the yellow pack at game start, as well. You don't want one pack to have 2 zombies and the other none.