The documentary illustrated how manipulative and conniving BL was. I don't think it was ever concluded exactly when Gabby died, but it seemed to me that she was killed by him before he went on his long hike. He was plotting and planning his motive, even when he was hitchhiking, to give himself an alibi that he was not at the campsite when she died.
Sending those texts to her, knowing she was dead. And then replying to himself with Gabby's phone, pretending he was her. On his drive home, BL sent himself an e-transfer from Gabby's account for $700 IIRC. In the notes, he wrote something...
"Great analysis
@Forest_Wood . I wonder if perhaps one or both parents might have gone with BL when he went to the preserve? Maybe two cars? Was someone hidden in the car or trunk?
IIRC there was some confusion as to who had left the house and whether or not it was the mother or someone or BL? And even the mother and sister were IIRC joking then, I believe in texts as to how could anyone confuse them for BL? And sadly IIRC by that time, GP was already known likely deceased or ‘gone’. SMH. And then there was a suggestion that no one knew where BL was? And all of a sudden as others have said within an hour of going to that preserve the parents find him in what is it a 40,000 acre swamp? While authorities and others have been looking for him for days?
The two additional things I would have liked more clarity on were the gun and the silver Mustang. There was a gun shown early when they were both riding in the car and GP was shooting it out the window while she wore earplugs. And then the gun he later used on himself right? I wonder where that come from and who owned it?
And the silver Mustang, was that BL or his parent’s car or his mother’s car? Some of the early video when GP was skateboarding on that closed street, if I remember correctly, BL was filming all of that riding in that silver Mustang.
The last thing was a little point about who owned the van? It seemed IMO that BL parents were trying to confuse police as to who owned it whether it was jointly with BL and GP? But fortunately, by that point Florida detectives were already clear on it, and they impounded the Ford Transit van immediately.
One thing apparent - it’s a good thing that IIRC the Long Island, NY police pressed hard on authorities down in FL early on in the investigation. And it’s unfortunate that that one Moab police investigators initial thoughts on a domestic violence incident in the van wasn’t better followed? IIRC he seemed to feel that GP was perhaps the victim.

MOO"
Just bringing this forward
@I am not Sherlock H.
I don't know how all those people outside, as well as those responsible to watch the house and the cameras, missed him leaving/not returning. It's a mystery and seems that someone wasn't doing their job and then came up with the excuse they mistook his mother for him. I think LE just wasn't paying attention IMO.
It seems the parents knew exactly where to look for him because they knew his patterns and where he liked to frequent in the park. That makes sense to me. He went to his favorite spot in the park to reflect on his life and to end his miserable life. This also illustrates that his parents knew their son very well. They knew him so well that it took them under an hour to find his body, when all those LE workers with all those resources couldn't.
This is why I believe, no matter what they claim, the Laundries knew their son had killed Gabby from early on, likely from the time he called them from Teton.
As for the van, I can imagine that BL put money towards that van too. It was in Gabby's name, but most couples at that age would be responsible for paying for the use of it. It was reported that he helped to fix it up for their trip. It's not unreasonable to think he contributed to the cost of the van or that they considered it "theirs". However, I believe he took the van not because he believed it was his but to support his psychopathic plan that she had left him. He needed a means to get out of there, and her van was it.
As for the gun, I don't recall it being focused on very much. Was it the same gun in that video that was used to shoot himself. Was it his gun or his parents. Where did he get a gun. How long did he have it. Did the parents know a gun was missing if it was theirs. It's a mystery.
MOO.