The only things that makes me doubt the mountain lion hypothesis are the fact that there is no evidence for it, and the fact that it is extremely rare for a mountain lion to kill a child.
There is no evidence that mountain lions hunt at Timber Creek campsite, no evidence that any were there on that day, no reports of anyone seeing mountain lions - or tracks, or scat - in the area and no reports of mountain lions ever stalking or attacking anyone in that area.
The sheriff did say recently that they had been looking for mountain lion scat in the area, but didn't say if they'd found any. I have read online about bears being troublesome in the area because of trash left out, and about wolves hunting in the areas, but haven't found much about mountain lions at all.
I have looked at videos on YouTube of mountain lions stalking or attacking humans and other animals, and they aren't as invisible and the kills aren't as fast and efficient as I expected from what I read on this thread. I think it's extremely unlikely that in a matter of a few minutes a mountain lion would silently kill DeOrr and then carry him away without leaving a trace, and then devour him entirely without any searcher disturbing it. Yes it's possible, but not likely. Given all of the millions of people who camp and hike in cougar territories, I have only been able to find a handful of cases where it might have happened before.
ETA having said all that, I still think it's the most convincing theory at this time, if the timeline we have been given is correct.
Raymonde, what has been posted here, in most cases, is from years of research by people who have spent years studying these animals. What has been presented regarding the nature and behavior of mountain lions is factual, not opinion. Early on in these threads, a number of cases of lion attacks were discussed that involved both children and adults, the majority of those in North America, and they are more than a handful. Although an attack by a mountain lion should not necessarily be expected in areas where they habitate, the possibility surely exists and previous cases indicate that. I read about a husband and wife team of wildlife photographers who wanted to photograph the eight large cats of the world in a period of one year. They stated their greatest challenge was capturing the mountain lion on film. They give a step by step account of their challenges. It's a very informative read. Sorry, but I didn't keep the link but I think it will be easy enough to find. Wildlife cameras have allowed us to see mountain lions in their natural habitat and first hand accounts of witnesses to mountain lion attacks give us a birds-eye-view as well.