The drone photos are excellent. One of the best things I've seen in a long time in regard to this case. They should be part of the videos thread.
Those photos are the best depiction of how wide open Hoosier Heartland Highway is, regardless of the Lafayette direction or the Logansport direction from Delphi. That aspect stunned me before I got within 15 miles of Delphi. I kept repeating to myself, "He was long gone." As you can see from those drone photos there is nothing near the highway like homes or convenience stores or gas stations or anything else. Mile after mile. Wide open spaces. No threat of stoppages. Really the only opportunity to capture something would have been a faraway view from one of those buildings near Freedom Bridge, or cameras on Freedom Bridge itself. Those do not exist, or did not exist in February 2017. I'm sure Bridge Guy checked that beforehand.
Also, Falling Down pointed out recently in this thread that Bridge Guy had to get the girls down the hill, and once they were down the hill they were essentially trapped. Exactly correct. It feels like a different world down there. You might scream but there's no guarantee anyone will hear, let alone react anytime soon. I felt like I could have screamed at the top of my lungs and I'd be waiting 15 minutes for anyone to react. Where are they going to come from?
Once down the hill the only escape route that doesn't require a considerable obstacle is the narrow passageway back underneath the bridge. Everything else is either severely uphill or across the creek. Here is one photo I took while walking toward Deer Creek. I wanted to demonstrate how steep the hill is and also that it is not square. It curves around, essentially boxing you in even more. The home atop the ridge would be up to the far right of this photo. The girls could have run there easily atop the bridge. Once down below it is exponentially more difficult. The likely route to Deer Creek is angling left from this photo, maybe 30 degrees.
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Heck, I'll include a second one. This is more the direct route to the creek. It's possible they may have angled somewhat left of this, given more open spaced in February than I saw in November. The hill from the prior photo is visible at top right. It would be 15 yards to your right during this fateful walk:
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If I had to guess I'd say Bridge Guy remained to the girls' left as they walked toward the creek, solely to keep them furthest away from their best escape direction.