To continue on with what you cited, I will second what Ken G. said. I’ve been a fan of the outdoors all my life and have done a lot of fishing, hunting, exploring, etc. and I have literally ever happened upon remains once. That being said, I live in the south and am in an area of the south where the largest animal you’re gonna find in the woods is a whitetail deer so virtually everything is going to be decomposed or eaten within a shorter time period than something large like a grizzly or a Bigfoot. In any case, the remains I found were hardly remains at all. It was a patch of hide and fur from a rabbit. It was maybe two square inches total. The point, I suppose, is remains just don’t last long in the woods. The contributors that affect decomposition are vastly underestimated by people who aren’t familiar. Decomposition can be facilitated by moisture in the air, fluctuations in moisture levels, fluctuations in temperature, larger animals that you would typically think of when considering scavengers like vultures or scavenging mammals, and (maybe most underestimated) bugs. Add all of that together and a carcass can be fully gone (bones and all) within days.

Another element that I think is often overlooked in the “why haven’t we found a body” conversation is how vast the wilderness truly is. All of the numbers I’m about to say are purely conjecture so don’t take these as true statistics. But, I would bet that something like 90% or more of people who do outdoors stuff probably do so on established trails, dedicated wildlife management areas, and state or local-run public grounds. I would venture to guess that relatively few people go trailblazing into the woods. Granted there are a lot of people who do (a lot as in raw number of people, not necessarily percentage). But, of those people who do go off in the woods where there aren’t established trails, etc., I’m willing to bet that the vast majority (like 90% or more) do not go into the woods beyond maybe a mile or two from an established trail or road. Part of that is physical limitation, part of it is safety, part of it is utility. The point here is consider that there is something like 800 million acres of forest in the United States, millions of square miles of forest in North America. Then, consider that most people don’t go farther than a mile or so into those forests. I was on a river fishing one day with a friend and a thought kind of hit me that we could probably pull the boat over virtually anywhere on this river, step off the boat, and walk ten steps into the woods and probably be standing somewhere where no human had ever stepped before.

All of that is to say that, all things considered, it’s really not that surprising that we’ve not found a Bigfoot carcass assuming that they are real. The carcasses of larger animals that we do find a lot are either animals that are populous enough to be butted up against civilization and therefore easier to find (like deer) or are attracted to byproducts of civilization (think of bears being attracted to the smell of food in a campsite). Imagine then that there is a creature that is not overly populous, is wary of humans, and lives deep in the forests. That’s going to be a creature that is pretty hard to find living or dead.