Zombies are really just slowly decomposing to begin with, but who knows how long it would actually take, and odds are, they'd still be "mobile" to some extent, even if it meant crawling on the grounds.
This is exactly why I want to know how the whole group could not smell all of the decomposing flesh in the barn.
Granted, the whole world, or at least Atlanta, probably smells terrible, but there were quite a few acres of open air on the farm.
(Not that this makes much of a difference since that part is all through...)
Watched the latest episode finally. Can't wait for Sunday!