I've been thinking lately about just how different this attack is from the others.
It is elaborately staged. Z lingers. All the others are quick in and out.
Z communicates with his victims, unlike in the other couple attack for which there is a surviving witness. The rapidity of the other couple attack argues against extensive communication with the victims, and certainly against the kind of story telling he does at LB.
It is in an open, public place. The other couple attacks are in more private, secluded environments. The Stine attack also differs from the other couple attacks.
It is the only attack that takes place away from a public road or a street.
As far as I can tell, it is the only attack to take place before sunset. The car door message says 6:30 pm, and the sunset was at 6:59 pm on that day in the SF area.
Unlike his other attacks, and despite its spectacular nature, Z never claims it in a letter. He leaves a physical message at the scene of the crime (the car door message).
I am not sure what it all means, but I think it is very likely that it means something.

