Excellent post.
Bundy's choice of victims (educated young smart college women) vs Green River's (vulnerable women) was also part of his downfall. He was dissed by his wealthy, educated first gf and was struck back at her type over and over again due to narcissistic rage/rejection. If he chose different victims he might have been off the media's radar a lot longer which is absolutely horrifying to me.
I recall the police and media reassuring the public The Green River Killer only went after prostitutes and not to worry.

They are victims too.

To tie this back to Delphi and the BG guy, he chooses a small town for his killing fields, close to home? the comfort zone for his first kill? Why two teenage girls?
Targeted or they were types that humiliated, rejected and bullied him (in his delusional psychotic/psychopathic mind)?
What do his victims say about him? The area?
Do women frighten/intimidate/enrage him so he chose easier targets?
So many questions I have...
I, too, have questions...
Ted Bundy, very likely, started killing much earlier than he stated - some say, as a young teenager. If true, and likely, it is true, then his gf’s abandoning him was maybe have not even served as the provoking factor, although it did shape the choice of future victims. I believe that his biggest narcissistic rage was the fact that he planned to advance, in law and politics, but law school proved difficult as he had to compete with pretty smart people. So soon he stopped going to school, got bored, and reverted to his favorite pass time.
At least, as it is known now, Bundy had severe mental illness on mother’s side - both maternal grandfather and grandmother were severely mentally ill. About the father, not much is known. His mental illness was neither diagnosed nor treated in time. Another interesting thing, there is not a single male friend in his life, so all these terms routinely used for him, “social”, “charismatic”, may be slightly off-mark. He presented well, initially, and he had high IQ, so he “passed” as social.
As to GRK, well, he “likes to talk with women”, as his interviewer said, but what would you say about his poor eye contact? He is an odd man; his IQ was 92 and he barely made it through school, yet he did well in the Navy and at work, was his low IQ merely some isolated learning disability? Unlike Bundy, who spoke of women as of beautiful things, GRK saw women as objects, only full of avarice and having secondary, financial, gain.
It is true that he preferred prostitutes, but it was his known area. Again, he probably killed more than we know, so maybe, not only prostitutes.
I think BG has relationship issues; whether targets are “revenge”, or he expects younger subjects to be “pliable”, is unclear. (The fact that the girls put on a fight enraged him, so maybe he is after young and passive targets?). Strictly MOO.
The comfort zone means he definitely knows it well. Grew up there?