Here's the problem with Owen not seeing anybody(or so he claimed)...
Let's say for a second, that Owen passes by, and the kids are ducked down in their seats,and Z is ducked down in his. Owen claims that about a 1/4 mile down the road,he heard a shot. How likely is that? It takes, what, 20-30 seconds if that to drive a 1/4 mile? If the above scenario was true, Z would have had to jumped out immediately after owen passed by, and walked around and shot within seconds. That would leave no time really to try and order them out of the car, threaten them, small talk,etc, he would have to have fired almost immediately.'
As far as the other scenario about Zodiac having the kids crouched down behind the car when Owen passed by,it doesn't match the facts. The evidence shows that Z got them both out the pass side door,and immediately shot Dave,and then Betty ran. If they were being held down behind the car, they likely would have made the break for help when they saw Owen coming along,and ran towards the road. I think this 2nd scenario is very unlikely and does not match the evidence.
My entire problem with Owen, and why I consider him a suspect, is that everything the police believe they know,is constructed by owen's statements. He is the ONLY person known to be at the scene between the victims being last seen alive,and being found dead. He said in one statement that the cars were 3-4 feet apart,but then also says they were 10 feet apart. In his first statement, he doesnt mention hearing a shot,but 3 days later, in his 2nd statement, he suddenly remembers it. I simply find these holes too big to dismiss. Out of all the witnesses and passerbys on the road that night, he is the only person there with no witness or passenger to support his story.
I am no cop, but if you are the only person confirmed to be at the crime scene after a murdered couple was last seen alive, and before they were found dead,then you have to be ruled out,especially if your statements have holes like swiss cheese. Owen was not ruled out. They did not check his prints. They did not check his writing. They DID check his rifles,when they thought a rifle was the murder weapon. When they later determined a pistol was the weapon, they did not test any of his handguns.
Everybody has a thory on why Z waited 7 months to attack again,and then write a letter. What better reason then if you have been questioned multiple times by police,and want to wait until you feel you are no longer a suspect?
Maybe I am missing something,but you have a guy that hunts,own multiple guns, just moved to the area before the murders,had just got out of the Air Force(wingwalkers),and was right in the age range of the Stine sketch (Owen was 39 at the time). Seems like he fits Zodiac's profile closely.

