I'm prêtty much convinced that he parked at the cemetery. I'm wondering whether he saw the girls being dropped off - as that would mean that he was at the drop off location at the same time as the person who dropped off the children, or perhaps he initially had another victim in mind. Alternatively, he just happened to be looking for an easy victim that day and decided to park at the cemetery and look for an opportunity. I do think that he was at the park to abduct and murder a female victim. It's not surprising that no one saw him on the trails because I don't think he was on the trail. I think he parked, crossed the creek, crossed the private residence road, walked up the hill, and passed the girls at the SE end of the bridge. I think the reason there is video of the suspect is because after checking to see that no one else was on the bridge, he turned around and abducted the girls - and that about-face is what caught the girl's attention.