Hello everyone, a very long time lurker here. I have really enjoyed reading your thoughts and opinions on so many topics. I thought I would join.
Here are my thoughts.
This location is very interesting in that it is rural yet one would expect activity on the trails. BG must be comfortable in a rural areas based on his attire and his ability to maneuver the girls to a more secluded location. I believe he acted alone.
I would have thought that he had been to this area more than a few times in order to setup this crime. However, I am doubting that since no one claims to have seen him (to our knowledge) on the trails before.
I am not sure if his main focus, before the attack, was the location or the girls. In other words, had he scouted the girls and chose the location based on their activity or had he scouted the area and waited for the right time and victim(s)?
I believe he parked at the cemetery and walked to the creek then on to the trail. He may have done this previously if he scouted the area.
I believe he passed the girls then turned around, followed to gauge their fear, then waited for the right time and location. I don't think much time passed from the initial encounter to him directing them to leave the trail.
I think his intent was a sexual assault. I am not positive he intended to kill them but it is likely.
I am at a loss as to how he controlled both girls. He may have used a gun to threaten them but, based on a fear of being heard and the "pristine" comment by the land owner, I don't think he used the gun to kill them. That leads me to think he constrained (at least one of) them with rope while attacking the other. Looking at his jacket in the picture, it shows plenty of room inside for rope and other items.
I think the attack occurred at or close to where they were found. I just don't see him taking them away and bringing them back.
I do think he left behind DNA. I would think it is difficult not to leave DNA. If he was that careful, I don't think LE would have the audio recording. That recording leads me to believe that at least one phone was left at the scene or close by.
Most likely, either the DNA or a tip from someone who is around him somewhat regularly will be what gets him connected to this crime. This could take months or years. I hope my guess on timing is way overstated and he is caught soon.
Sorry for the long post and thanks for letting me get out my opinions. The above is my opinion only.