The voice doesn't match the looks for sure, which may be why LE believe others "participated". I'm not sure yet which to believe, but I lean towards only one person being involved. I would love to know if they search the two most covert escape routes. I was looking for the video showing EL searching the area, the one with all of the choppers in the air. I can't find it though. From what I recall they were searching the road by the drop off point. I'm not convinced the guy even knew it was there. He may have thought the girls were from the houses on the south side and taking them across the creek would make it harder for someone to find them.
Or, if he parked in the cemetery, he wanted to be close to his car if he had to flee.