Again, I have to go back to what I know for certain, and that is what I know about that area. I don't think JR has anything to do with Jenny's disappearance. For whatever reason, she chose to go backpacking in one of the most crime ridden and dangerous areas of the world. This suggests to me she was unwell in some way, her thinking not clear.
If the report that Jenny got on the Corona truck is true, her body will most likely be found within a mile of the original pick up spot, dumped on a side road, in ditch somewhere. Her remains will eventually be found.
There is a very slight chance, very slight that she is in some delusional state and is traveling igcognito. She may be paranoid and thinking she needs to hide. Her actions up to the point of disappearance suggest that theory isn't too fanciful. But the highest probability is that she is now long deceased.
I do *not* believe the husband has anything to do with her vanishing.
Jenny came across as someone learning that she'd been naive to think of the people as kind and innocent when she had the financial encounters with the people there - demanding money or the police extorting money over a helmet (not sure if the bike rider was in on the scam, but for the amount the extorted, I wouldn't be surprised). She hadn't had the school of hard knocks, but this happens with younger people less experienced in the world.
If indeed no longer with us, there's a good chance her remains may never be found. There's a book out there by an investigator who tested what happens when you leave a body in a deserted desert place (he used pigs I believe) and within a period of time, nothing remained of the remains. Wild dogs, coyotes, vultures, what have you, would take all there is. For the same reason you never see animal bones in a forest or some other wild area. They are gone quick.
I wonder how long JR will continue to look. I suppose at some point he may have to leave the case open and move on with life. I just find it hard to believe she chose to just disappear from everyone and live in secrecy and no one say anything. But one never knows...