morf13 wrote:Maybe he knew Cheri, thus, used her name. Maybe he did not know the Z victims, assuming that the confession letter writer and Z are one and the same
Yes, maybe he did.
But then we have another problem on our hands, IMO. He kills someone he knows. In rage. Going nuts with a weapon which looks like it wasn't brought along for the purpose. Extremely personal. Or – he doesn't kill her, but inserts himself into the case via the letter (but still knowing her).
I don't know which is worse, so to speak, but both possibilities seem very problematic to me. Because if this is Z, we know for a fact what he did afterwards: Two years later he killed a couple of kids, execution style, highly impersonal. Took no credit immediately, which is arguably odd if he had already established himself as an attention seeking letter writer.
Then half a year later he kills another couple, in the same circumstances, again execution style – again nothing at all like Bates. And then he sends his first letter. Which is a proper three-part letter, unlike the Bates notes – which aren't a three-part letter at all. They're three notes, all with the same content, namely an extremely brief message, which are sent to a newspaper, a police department and the victim's father. Z's – actual – three-part letter is sent to three newspapers, no police or relatives involved. It contains a cipher, the content of which is a lengthy rant about himself.
The Confession author's main focus is his victim. She was stupid, she was attractive, her breast was firm, but he had to kill her, she had to pay for the brush offs. She's important, he names her, it's because of her he has to confess.
Z's letter is a mission statement. Or an obnoxious, taunting sort of declaration. The beginning of a grotesque publicity stunt. There's nothing there about the victims themselves other than technicalities to prove he killed them.
Sure, it's possible he simply didn't know them – but did know Bates, and hence the difference. I'm not sure this explanation will suffice, though. If it was him all along, then he progressed or developed (or whatever one wants to call it) from the deeply personal to the completely opposite.
Either he progressed from rage killer (most likely knowing his victim), or he progressed from simply taking credit for Bates' death (in a certain manner). From A or B then – to Z. The question is how plausible this movement actually is.