Vanilla, Vanilla..Skandinavian girls are always welcome
You wrote:
Although Mike might not have been able to get a good look at the killer, it is quite obvious to me that it must have been an accurate observation that the killer was about to leave then came back and shot a second time when he saw Mike appeared alive, because thats something Mike would most likely notice and remember. As far as I know, in his first statement Mike clearly had mentioned that he had not seen the face very well. The only thing he could remember was that Z had a large round face. Regarding Fouke's sketch: Similar, a second was drawn because the first one was too slim. Kathleen Johns pointed at this second sketch. Z might have had even a rounder face than on that sketch.
What I like is your observation that Z hadn't talked to his victims. He did, however, speak at Lake Berryessa, for about half an hour as far as I know. What is interesting is that there a 'drawl' was observed. Combining this with Z's phone calls ('Goooodbyyyye') makes it possible
that Z not only was dyslectic but also had some problems with his speaking. This would explain all the three: Rather not speaking to his victims, his certain drawl as well as the strange 'gooodbyyye'..
Welcome
QT