I have been following/lurking from the begining, but this is my first post. I live just a few hours from Leadore, in MT and we camp in remote locations with our children, so this case struck close to home.
The oversized boots have been a problem IMO because I don't believe they would have stayed on the baby's feet. My daughter had a favorite pair of boots that fit the same way Deorrs have been described. She often walked out of them and if running they would fly off her feet. When she fell asleep in her car seat and we carried her into the house, unless we made a conscious effort to collect the boots, they never made it in with her. They had either slipped off in the car or once we picked her up. based on the description given, in the case of a mountain lion attack, I don't understand why the boots have not been found.
As for mountain lions, they are in the area. We camped, on fathers day weekend, at a site about 100 miles from Timber Creek, and I was informed by someone who lived near our campsite to be aware because there had been several big cat sightings.
Sorry I know this is long, but lastly there was discussion of why one would question if JM and DS were up to something other than "exploring". IMO and JMO I think it is because of the lack of exploring details. DS was quite descriptive about SAR and the volunteer search, but simply stated he and JM had been exploring. IMO I had expected more details, such as...we wanted to check out a trail that parralleled the creek but weren't sure it'd be safe for the baby so we left him at the campsite with GGP, JMO.