Middle of the night is the only other time that would make sense. Searchers arrived at 7:30 AM and they were found at about noon. Unless you're suggesting it's logical to bring them back to the area, either already deceased or alive with the intent to kill them, while there is a full scale search operation underway.
They were found in a wooded area that was about a half mile from the north end of the bridge on land, much closer to the south end BUT on the north side of the creek. Very close to the spot where the picture of BG was taken, is a hill that leads down into some woods and rough terrain (not necessarily a trail), and takes you to the creek bed. They were found on the other side of the creek from there. I think the searchers that found them accessed the area from the rear of RL's property.