Between Marty's home and last location, and where his remains were found... is an hour and a half away by car. And at least 24 hours by foot. Clearly he was abducted. He would not have left his lunchbox and cooler outside his home if he went willingly. He may have been part of the so-called 3%, but I think more likely it was something personal. I noted that he and his girlfriend were estranged. Could an ex-boyfriend, ex-husband of hers be responsible? Taking it upon themselves to right a perceived wrong? Or it could've been a lovesick acquaintance of hers that was just weird and out there enough to think that Marty needed to be "taken care of".
Someone closed the gate to Marty's property before they left with him. That or they parked their vehicle outside the gate. Many people out here in Eastern Washington and Western Idaho who live in remote, forested properties have swinging gates with locks. I wonder if Marty's gate was normally locked. Some people "fake lock" their gates until evening so they can have visitors until they lock up for the night. Sometimes they leave their gates open until they retire. I wonder if that was the case with Marty. I wonder if he let them in, or this person was waiting for him.
Marty comes home and there's a vehicle there. He gets out of his vehicle, takes his things out, preparing to go inside, exchanges words with this person, and this other person pulls a weapon on him and forces him into their vehicle. I don't know, the whole thing seems odd. I'm guessing this person was known to Marty, otherwise I doubt Marty would've taken the time to take his lunch things out of his vehicle. To me that shows a level of comfort that I wouldn't feel if I came home to a rural property and there was a strange vehicle in my driveway or outside my gate. I'd stay in my car and try to determine who it was first before getting out. If I felt the need, I'd drive off and call 911. But then Marty was a big guy, and he probably thought he could take care of himself, regardless.