Here's the video:
[I don't know if it's me, but the music in the background is very distracting! I also changed the settings to playback speed to 0.75 -- she speaks very fast!]
ETA: I just listened to the entire podcast and there was no mention made of meth. I do believe that issue was raised in the True Crime Garage episode (see above post). If Brandon was under the influence of meth, I can see where he could have become very confused, paranoid, got lost in the woods and succumbed to dehydration, or bled to death due to his injury. Despite the intensive searches that were done, maybe they missed finding his body. (IMO)
There is also the possibility of Brandon being involved in a motor vehicle accident with someone. That individual could have become violent with him, mortally injured him, and dumped him elsewhere. If he was still alive when he was dumped, he didn't survive due to blood loss and dehydration. (Just another theory that has been suggested before.)