I have only been following this case a short time and have been going through the threads (incl. Media, Maps, and Timeline) here and on Reddit, where there is a pretty decent timeline, as well as listening to some of the well-known podcasts about the case, and I still have plenty to get through.
So far (because of the two different sketches that were both based on witness observations on the day the girls disappeared and the fact that there were two victims, both athletic and very intelligent, and at least one of them as strong as most adults), I strongly suspect that more than one perpetrator was involved and that BG's role may have been to locate and corral the girls and direct them toward the location of a hidden perpetrator (who looks like the second sketch), who was the primary actor in the murders and the one who solicited the help of BG. This would also mean that the murders were planned and that at least one of the girls was specifically targeted by an adult who was paying close attention and somehow learned they would be at Monon High Bridge trails that day (by observing his child's social media, or through secondhand information from someone who did that or who otherwise gained the information).
Both Abby and Libby were strong academically and both were athletic and participated in multiple sports (volleyball and softball for Abby; volleyball, soccer, and softball for Libby). Libby had even taken at least one forensics-related course offered by Purdue University. They also both seemed to maintain a decent level of situational awareness and were aware when they were in the presence of potential risk. Given these characteristics, they were among the last one would expect to suffer such a horrible fate as happened on Feb 13, 2017. But, I keep thinking that maybe it was the fact that they WERE exceptional that they became targeted and ultimately became victims.
I wonder about the possibility that the girls were murdered to eliminate one or both of them as rivals who might have been in the way to someone else's pursuit of a spot on a varsity or elite (volleyball?) sports team or admittance to or a scholarship to Purdue. I know this is farfetched, but since the Wanda Holloway case, it seems a remote possibility that must be at least considered. As WH demonstrated, it occasionally happens that some parents will do even the unthinkable to better the odds of their own child's success and they will even go so far as to solicit the help of someone they expect to be willing to participate if given adequate motivation (money, sexual access to the victims, blackmail based on some kind of past offense). If the perpetrator believed he was eliminating strong competition for a substantial scholarship, there could be a financial motivation as well.
