Your interpretation of the angle of the photograph is all wrong. Look at the pic and line up the small tree and the sign and it's something like the pic below.
Now.. I'm sure that's not going to convince you either so let's take it this direction. The photo below is the laundry bag and the black bags. The photographer is standing directly behind, facing Suburban Dr (north) and shooting down. The bottom of the photo is just forward of the skull based on the the description of Yuri's report and Welch's forensic reports.
Now, look at the vegetation around the bags. It doesn't match. The bags are farther to the right than you think they are.
Here's another shot facing East Northeast from the remains. The area you are looking at is in the back ground.
Another shot facing directly east. I've put a box around where you are saying the skull is.
As Forest Gump once said "That's all I've got to say 'bout that"