The LE bodycam footage bothers me. The way they talk to her like she is the problem. She's crying and clearly really upset. Brian appears to be smiling through the whole thing. So the cops treat her like some hysterical woman. She explains to them that she just quit her job. She gave up stability to start over with new opportunities. She's stressed out trying to get her new website/blog up, all while the man she loves and is/was engaged to is verbally tearing her down and telling her she wont succeed. She suffers from a disorder that is already stress inducing. It appears that they were already having problems since the engagement was called off. Maybe they went on the trip as a way to reconnect, get material for her blog and it didn't go the way they planned.
Accident or intentional?
Either way, Brian Laundrie's behavior is screaming guilty. You don't return home from a road trip taken with your SO without that SO and driving her car. You don't hide in your house for 10 days without a word. You don't hire a lawyer before a person is even deemed missing unless you KNOW something. You don't avoid speaking to police to clear your name. You try to help find them if you weren't involved. Surely he knows he has gone about this whole thing wrong and is painting himself in to a corner.
I hope for Gabby's sake, Brian decides to cooperate soon. She needs to brought home to her family.
It is very very very very very very very strange to appear at your parents' house, without your fiancee, more than a month before you were scheduled to appear, and not have them wonder where she is or ask questions. They knew a full 10 days before her mother did that the two had split up or parted ways (presumably that was what he told them), and that Gabby was out there, somewhere. Unless he flat out told them something incriminating, presumably, they heard some sort of explanation from him, saying that they broke up and she was staying with a friend, or they broke up and she was returning separately (or something). There is no way that they didn't ask where she was.
I'm speculating, but knowing how most people behave, I just think that her mother must have first tried Brian's phone to see if she could reach her daughter, in case her daughter's phone wasn't working. Getting no answer, it seems like there is no way that her mother didn't call his parents to ask about the two, as in, "I haven't heard from them in ten days, have you? I'm starting to get a little worried."
By the time her mother called (I speculate that she called) his parents, he would already have been home. They probably didn't know yet that her mother was totally in the dark about the split. Unless he told them he was in trouble... don't you think they would have taken the call and acted surprised that her mother had no idea where she was? And then at least told her the story that he told them? I am just grasping to try to understand why they didn't tell her something, even just passing on some story that they heard from their son.
So when her mother called, presumably before she suspected anything, inquiring about whether they had heard from "the kids," you would think they would have said, "Brian came home early, he said that Gabby had decided to stay with her friend in xyz, you haven't heard from her???" Since they didn't do that, it just seems like Brian told them something that made them want to protect him, and they had already decided to stonewall by the time her parents came a-calling. That, or they were shocked to get a voicemail suggesting that Gabby hadn't been heard from, and before calling her back decided to ask their son. Hearing some sort of nonsense from him, or maybe even a confession, they decided at that point that he needed to be protected.
A bunch of rambling thoughts, but I guess I can sum them up by saying,
a) It seems like her parents must have called him
b) It seems like her parents must have called his parents
c) It seems like her parents calling probably tipped them off that things weren't adding up
d) It seems like at some point they determined that their son was in big, big trouble, which is why they never ever cooperated with her parents.