Some things from looking at this google earth shot-
The terrain is rough. it is a steep drop to the creek in a number of areas.
If he walked them there from the bridge. It had to be with some method of controlling them. The other thing that the creek area is from the line of sight from the bridge until you get to the second area. This is part of why I felt the perp may have taken them to 2nd area because I thought he may have walked them to a spot until he felt they were no longer visible from the bridge. The thing about this is how would he know how far he could go without coming to the back of another property and into view if he weren't at least vaguely familiar with the area.
I also looked at the cemetery and there does appear to be a an area in the SW corner of it that a car could park and be reasonably hidden. This could support the idea that they were taken from somewhere between the drop off area and bridge and driven to the cemetery.
Again, I'm not sure where they were found as I've seen two different spots referenced.