Since they are not ruling out 2 POI in this case, one scenario is a father, son team. The son being the lookout and the father being the predator. The younger one may not have realized what he was going to do also, just stayed with a truck or vehicle and told to wait. I don't think this older guy on the bridge lives there, or the other person. Maybe traveling through, but he is too distinctive to miss. His gate is also a bit awkward, he appears to lean to the left, as if his right hip is a problem. But at any rate, he had a weapon to control the girls, for sure, a hand gun would make sense, but he didn't use it for his kill. Just my thoughts.
JMO I look and look at the stills from BG on the bridge and the action video. BG looks conpletely disjointed for lack of a better word. Why didn't LE just give us the whole video of him walking so we could maybe clearly recognize him? Was it because there is more in the video that they don't want us to see? I still believe that Abby was somewhere in there. Any thoughts?