I'm a Hoosier and Have been watching and reading about this case since the girls went missing. Here's my 2 cents.
LE comment 2/15/17/- " know where you're kids are at" know what they are doing" At the very least Know what's going on in their lives, that's the most important thing I can say at this time" This was either a highly insensitive comment (considering as far as the public is aware the parents knew where and what the girls were doing) or LE made this comment based on evidence. I think the latter and because of this statement I believe the girls were not there to only hike that day, but to meet someone. IMO Abby in particular was there to meet someone, given that she is the one in the picture, and she was more dressed up compared to Libby (Libby was wearing sweatpants and tie died shirt with running shoes) IMO the snap chat picture is like a "she's here" pic, also IMO BG was/is on Libby's snapchat, (there may or may not be 2 perps I go back and forth) the look on Abby's face is shy/nervous like she's waiting. IMO Libby was recording Abby or the creek and accidentally captured footage of BG, which would explain the distance angle and poor quality of the pic. IMO once BG came up on them they recognized him and went with him back across the bridge, at this point they went willingly or were forced to a building, house, barn, silo etc.... I believe this because IMO, "girls clothing in the water" (mentioned by a journalist) would've been seen by searchers also the girls obits, death dates, are Abby 7/14 Libby 7/13 IMO these aren't mistakes (Someone would've clarified by now) and from personal experience time of death is determined when a qualified person assesses the body ( doesn't matter what condition the body is in) Point being IMO searchers would've found them. IMO BG bound or restrained the girls and separated them. This is the point when I believe Libby turned the audio on, if her hands were bound it would explain why she didn't call 911 but was able to activate record on her phone,( I accidentally do it all the time on my phone) When BG says "down the hill" it doesn't sound like a command or threatening to me, I would actually say it sounded like an attempt to reassure Libby or calm her down. This is pure speculation but IMO Libby asked a question like where are you taking me, and BG responds cooly "down the hill" IMO he walked her down the hill and that's where the "stuff of nightmares" comment comes into play. He returns repeats the same with Libby, IMO it was dark outside hence why the bodies were not found right next to each other but a few yards away. ( that bit of info was reported a few days after the bodies were found, by a local news station, if you look you'll find it) he discarded the clothes in the creek to wash away any fibers or evidence from the building or first crime scene, because he's personally connected to that place (he thinks he's smart but he's just a Deviant) IMO I don't believe the crime scene was anymore gruesome then expected, (like some are implying) because IMO LE Wouldn't have told the public "we don't believe there is any danger to the public" if it was unexpectedly gruesome. I think the "twist" comment is in reference to the audio, the fact that these were two young girls, and the only motive is pure Evil, or the "Twist" could be that they were killed on separate days, but I don't think the comment had anything to do with the scene of the murders. IMO BG is in his thirties and possibly young looking for his age, (the voice in the audio sound like 30-35) he's not as big as he looks, he's wearing layers and was overdressed for the weather that day, which might suggest he started his morning in a colder climate, example, Michigan (which is about 4 hours away from Delphi) had snow on the ground that day but Indiana had unusually high temps. IMO BG is very familiar with the area, (his confidence in snatching two teenage girls in broad daylight with no witnesses) BG possibly grew up there or hunts and fishes there often, he has family or friends in that specific area. IMO the spot where the body's were found is "special" to BG because he intentionally left them where they would be found, he picked that spot for a reason.
Sorry so long and just one more time in case anyone missed it, all this is MOO.