So, this isn't a new idea by any means... but the zombies are, in a fashion, a character in the story. I'm sure there must be a lot of theories about the zombies and what they all mean or even what they represent. That's some of what I'd like to hear in this thread, if this is kosher in this forum area...?
I find the Ground Zero idea, and even its name, kind of fascinating. Seems to be leading towards an origin story, eventually. The sickness and everything is certainly interesting... for some reason I'm thinking of something having hit and possibly spread a spore or something of the sort. Not sure if its a bomb, a meteor, or whatever. It could be anything... but it might explain the proximity and the seeming effect in the air.
The construction/experimentation idea is interesting as well. The focus on the scars from the initial zombie descriptions being an interesting thought as well.
The variations, whether evolving, constructed, or some sort of mutation from some influence is certainly also interesting.
Just trying to get the ball rolling on this without going into my own diatribe on it. =)