I believe Suzanne was about to celebrate her last chemo treatment.
There were many convos about this in the early threads - that she was basically cancer free, and was going to be able to move on with her life. She could now go to another place, if she wished (hard to transfer one's chemo to a new place - can be done, but she was almost finished).
Ha- no, no street lights anywhere near mile marker 113 on Highway 17. Or in much of rural Colorado. Pitch dark at night.
Plenty of dark places nearer to Puma Path, but he knew they'd search that area and the Monarch Pass area, and of course, it was indeed searched.
BM helped in the search. He knew where Suzanne actually was, of course (IMO) and got lots of "support" from others during the search near Puma Path.
I'm going to say something slightly off-the-wall. Anthropologically speaking, when a family member choose a burial site, they often have deep preferences. Indiana is flat and my dad (who is from the flat part of Colorado) had all his ancestors and siblings buried in cemeteries that were...flat. Here in SoCal, there are plenty of hilly cemeteries (much preferred by some Californians). But, growing up in Flat Colorado - with the mountains in the distance (the way it looks on Highway 17), his heart ran to wanting a flat expanse of...grassiness.
I am assuming that cemeteries in Indiana are flat and grassy.
Highway 17 runs parallel to the mountains - beautiful mountains off in the distance. It's very peaceful out there. Various kinds of songbirds. I think BM is an evil manipulator, but I do not believe he is completely heartless. I don't think he would want to be seen as heartless. If he did indeed bury her out there, early in the morning hours the day after Mother's Day, he had to know that the body would be subject to predation, but he made some attempt at an actual burial.
I certainly hope her bones tell a story about her cause of death. The Big Questions I have are all around manner of death. But the burial, to me, says "BM did it" and he could not quite allow the "Love of his life, Angelic Suzanne" to be without a burial. He wanted to quell his own conscience with that act.
IMO.