You are right, rosesfromangels!
The crux is with having a POI as a Websleuther (and if the investigation of a double murder is lasting for 3 years), you will find more murders, the POI could have done also. Another state, another victim, female, killed or dumped at an area like MHB area: bridge, trails, park, forest, lake, creek, happened in broad daylight, killer escaped unseen, car witnessed or not (any way it was never his own car, I think). Always risky behavior by the killer, it seems.
Male victims I haven't considered, because I didn't stumble over a case yet, which reminded me of the Delphi -killer. Who knows, if there are even male victims, as long as one doesn't know the motive?
6000 bill boards in 46 states weren't enough to find him, because the pic of BG is so very blurry and he "camouflaged" himself so well. Idk, if he was underway in a part of the 46 states "only" or maybe even in Canada, for example. Or in Europe, or in ..... it never ends re assuming, where the killer might have murdered also before. We don't know.
I beg, he will be found, before Covid-19 takes him away, then without justice for Abby and Libby (and maybe other victims). MOO