It looks like the theory was based primarily on population density and rate of spread/infection. I was hoping their science and stuff would have concluded that Bigfoot and zombies don't get along and Bigfoot could clone into multiple Bigfoots (Bigfeet?) for an epic battle of good vs. evil high atop the snow covered…

You have a great memory and attention to detail.

Even if a civilization has eroded to the point where one harpoons rodents for dinner, one must remain civilized.

well that would explain it ;). I'll check…

I apologize in advance for posting questions that are not related to this episode but a few things my OCD mind won’t get over:

Apparently he wasn't around when the crew surrendered their arsenal. Glenn's inner monologue "if this cream-puff thinks a cute little handgun is sweet ass, I wonder if he can throw a punch…"

It looks like a trap/plot to get RIck chomped. Who or how did the walker get under the tarp by the blender gun? Pretty sure he wasn't there before. Unless the walker was taking a nap or playing peek-a-boo with his friends, it seems like he was put under there by someone. Did I miss something?