Everyone needs to watch all the chopper/aerial footage to get up to speed. The ones showing the body site, the unfurling of the tent etc.
It's clear in that footage that there is a gravel road nearby. The area covered by the tent has debris/grass/dirt. Her body is not exposed. So she is partially or fully buried (most likely).
It's pretty clear that she did not fall from a great height, hit her head while crossing a stream or succumb to the elements. This is in an area where there are other campers nearby.
There is concealment. Which indicates consciousness of guilt.
Even the murders of the two poor Moab woman, they were left out completely exposed, half naked in the river. I really don't think the two cases are connected at all now.
IMO Brian did it, Brian is guilty or at least responsible for Gabby's untimely death. JMO.