That scenario fits in somewhat to how I feel how BG fits into the murders of Abby and Libby. I believe he's been to the MHB, possibly several or many times, before. How would he know the private properties along the north side of Deer Creek, and the trails on them? The timing, variables in his favor, etc., conspired to allow him a short period of time of freedom to carry out his deeds. To me, that indicates planning, although he may not fit the profile of an "organized killer", per se.
I've driven the roads right around there, there are no signs for the bridge. Someone who has been there, before, would know where it is located, how to get to it, where the trailhead(s) are located, where to park, etc. Like the killer you described, BG just knows that general area near the bridge. How, we don't know.
One thing that's bothered me since the beginning, and more so now that LE thinks it's a young killer, is did he have the day off from work? Was he on the road for work and carried out the killings? On the way home from work? Is he a shift worker? Lots of questions on my end re: how he carried this out on a Monday afternoon most working-age people would have been working.
I've read up a lot on the Artemio Sanchez/Bike Path Rapist case in Buffalo. He struck in the latter morning hours in all of his crimes or most of them, IIRC. He worked a third shift gig at a factory in Buffalo for many years, so he had a regular job, at the same place, his entire or almost entire work career. Some of the crimes happened barely out-of-view of the factory where he worked.
Interesting you brought up the crimes in Mass., MassGuy, it jogged my memory about other cases where perps had certain work schedules which enabled them to stalk and prowl for victims.
-FD