I don't think we know what IR is saying to LE. We also have no idea what ggp is saying to LE, only what his relatives are saying he told them. GGP is a wild card, because he has been described as too mentally and physically unhealthy to be a POI, but later that changed to he is also a POI... I believe the sheriff made the change, only because people were asking why IR, DK and JM were POIs because they were at the scene, when ggp was also at the scene. It wasn't a ratcheting up of suspicion of ggp, so much as a way of implying that being called a POI is no big deal. Yes, there is no legal definition of POI, but there's some reason the four people at the campsite became POIs instead of remaining witnesses. AFAIK, witnesses can also "be there" and provide information about what happened surrounding a disappearance. If ggp says something that contradicts someone else's story, they can just say ggp has dementia and his memory can't be trusted.
I think the sheriff suspects foul play, and has since early in the investigation because:
1. Has anyone ever heard of someone being called a POI in a missing person investigation unless foul play was suspected?
2. Drones were used to take photos in case a criminal trial takes place.
http://www.eastidahonews.com/2015/07/lemhi-sheriff-on-deorr-kunz-we-do-not-suspect-foul-play/
3. The sheriff said investigators from Bonneville and Bingham counties have offered assistance in further follow-up investigations into any possible criminal histories of those involved.
http://lemhiweb.com/content/search-recap
4. The sheriff called the area where DeOrr disappeared a "crime scene".
[video=youtube;FV-h82eVQ1M]https://www.youtube.com/watch?v=FV-h82eVQ1M[/video]
5. The sheriff says abduction is the least likely scenario. He also does not believe DeOrr is in the creek or reservoir or was the victim of an animal attack.
Same link as above.
Until DeOrr is found, dead or alive, no one can rule out any scenario 100%, but I think it speaks volumes that the sheriff has stated publicly what he thinks did NOT happen. He must have some reasons for his beliefs. Unfortunately, we don't know what they are. I hope he's wrong and a nice couple like the one in "Gone, Baby, Gone" is loving and caring for DeOrr.