You have decent support for JDR and AM being at that spot, out of their vehicle, but what points to them then deciding to leave on their own accord, as opposed to them trying to escape and being re-captured and brought back to another vehicle?
And do we know if scent, like DNA can transfer? As in, if there is an altercation between two individuals, or say the perp decides to wear clothing of their victim, can a dog distinguish between the scent that is transferred or sweat or blood from a victim that might end up on a perp in a struggle vs, the actual person having left their scent?
If JDR and AM had decided to leave out of fear of some unknown thing, what would prevent them from contacting family and friends by now? How would they survive (there are reports that none of their cards have been used, and no access has been made to bank accounts)?