I agree with your post, TeaTime, but re the polygraphs: we don't know if those were the exact questions asked, and even if they were the answer should have been an unequivocal NO. If DeOrr wandered off and got lost, or got abducted, or got taken by a mountain lion, or got killed by IR and hidden, they should not have waivered over those questions.
Occam's Razor tells me he ran off and is outside the search zone. But the fact that every member of authority (LE and 2 PI's) have put out pretty damning reports about the parents (which would not be done lightly in my opinion and is presumably with the backing of the FBI) does rather suggest that there is something not right here.
I've said before we should attach less importance on the actual polygraphs, and more on the fact that all these authorities have met the parents, spent time with them, questioned them, seen their body language, heard some lies, got frustrated with the changing stories, and come to the conclusion that they may well be involved somehow.
I dunno. I'm sitting back until something else happens. The 1pm sighting has confused the heck out of me too!