Here's something I wondered about and I don't know if it has been mentioned before. If it has then sorry for repeating old stuff again.
I have seen loads of people say this guy may have stalked their social media, but as far as I can see nobody has mentioned how he could have done so on SnapChat. Up until December 2017 (so after the girls died) there was a function on SnapChat where you could add people who were nearby. So for example I live in an apartment building and I remember seeing this function and it showed me who else in the building was on SnapChat.
I did NOT have to add them to see their SnapChat names, it just displayed them. Wasn't Libby's name on SnapChat just her full name? If it was then by checking 'Add Nearby' this guy would've been able to see her full name in advance. I don't know if Abby was on there but again if she was it would show her SnapChat name. This creep could've checked their FaceBook pages with their SnapChat names too. But if they were both on SnapChat with GPS location turned on, he would've known that there were two girls out there (potentially) alone.
Is Add nearby still on Snapchat?
What say the killer was waiting around, constantly checking 'Add Nearby' on his SnapChat for potential victims and for a few hours nobody came up. Then, up popped the two girls and he chose his victims.
Has nobody thought of this?? It was taken down by SnapChat in December 2017.