A possibility why Jensen/Faraday had not exited from the drivers side of their car is that they had already left the car earlier, e.g. to talk to someone or because they believed to be controlled by a police officer. Not to forget that there is a police shooting range nearby.
Some more facts from the police reports (~20 additional sites can be found on zodiackillerfacts, great site!):
Bingo Wesher:
He lived at the 'Old Borges Ranch' by Humble Oil company. He checked his sheep around 10:00 PM in the area 'East of the Benicia pumping station'. He observed the white Chevrolet Impala Sedan at the South fence of to the pumping station (which is imo not the area of the police shooting range, imo). He did not observe the Jensen/Faraday Rambler, yet. However he already observed the red pick-up truck of Connoly and Gasser (p. 19).
Mr. Owen:
It was found out that Mr. Owen's clock went about 5 minutes fast. He therefore arrived at the scene at approximately 11:15 PM, narrowing the time for Zodiac to commit the crime actually to -2 minutes instead of +6 or 7 minutes. This makes him a suspect or at least a POI. It takes him about 19 minutes to drive from his home to the scene, so if his cuckoo clock was at 11:00 PM (actually 10:55 PM) when he actually had left, he even was there at 11:14 PM. Stella Borges arrived at about 11:12 PM and already found the bodies. However there are still two scenarios: First we don't know when Stella Borges did really arrive..somewhere it is written that she had arrived at the police station at 11:25 PM and possibly it takes her only five minutes to get there. It therefore is possible that she took longer than expected as we don't know if she had phoned before or after she had looked at her clock. The second scenario is that Owen had actually seen the bodies and passed by because he was afraid of reporting it to the police. The next day, realizing what he had done and reading about it in the newspaper, he decided to go to police telling them that he had heard a shot. It is even possible that he saw Zodiac committing the crime and is or was fearing for his life (p. 23).
Brenda:
There is a police report of Brenda, a schoolmate of Betty Lou. I think she relates to Ricky Allen Burton when she mentions that he was just 'using' Betty Lou at school. What he knows, however, is that Ricky (mentioned in the report) spends a lot of time with his brother-in-law. And this brother-in-law has an
'older car, it is blue with the paint coming off'. She heard that Ricky hangs around the 'Jumping Bean' on Springs Road (placing him near Blue Rock Springs). She also mentions a 'Luther', who drives a white pick-up (unrelated to the scene). But the blue car of her brother-in-law however could very well be the car that was seen at the crime scene, with a man talking to the guard. This would support a scenario that one or two people, Rick and his brother-in-law, could have been involved in the crime. Also, if the name of the brother-in-law is 'Pete', this would completely fit the description of Larry and Linda, who described Pete's car as a '52 Chevrolet, blue in color. And, finally, the brother-in-law is working at the auto wrecker where Ricky had gone right on the next day after the attack. He even claims that he got informed about the crime when his mother called him there (why did she mention it to him, if at all?). What appears to be gossip first, is eventually the most important information of the whole police report. And if the brother-in-law was the marijuana dealer who Dave wanted to
'turn in', there is not only some solid motive but also a very good reason for Ricky to threaten Betty Lou and calling her about every 15 minutes. And finally, this brother-in-law had access to other cars, e.g. used at the BRS crime scene (p. 35).
Stan:
He saw two cars around 10:30 PM. An 'Olds' 2-door, blue H.T. 88 (Don) (?) and a '63 white Chevrolet Impala (year correct?) with two persons inside heading towards Blue Rock Springs (p. 38).
Racoon hunters:
Frank Gasser and Robert Connely reported the time when they had left the entrance of Marshall Ranch at about 11:05 PM. They therefore presumably passed the scene before the crime had happened. The time of the attack can therefore be narrowed to 11:05 PM to 11:13 PM (Borges) or 11:14 PM (Owen), with Owen 'hearing' the shot rather around 11:14 PM (crime happened therefore sometime between 11:12 PM and 11:13 PM). The racoon hunters state that, when passing by at about 11:05 PM to 11:07 PM, they saw the Rambler parked at the 'bank', which is possibly the Southwest position. Earlier, at 9:00 PM, they also saw the white Chevy '59 or '60 Impala and a truck coming out of the gate, coinciding with Bingo Wesher's statement (probably his truck). The white Chevy driver therefore did not just went for a piss but rather stayed there for at least an hour. And, if it's true what they say, Jensen/Faraday had moved their car between 11:06 PM and 11:13 PM. This statement is contradictory to what the Your's had mentioned, that the Rambler was 'still in the same spot' (or they passed the scene the second time before 11:06 PM; p. 40 and the Yours report). Latter however is coinciding with the statement of 'Helen' who mentioned the car to having changed its position between 10:15 PM and 10:30 PM. Please also note that there is a picture of the Rambler, standing on the West side of the gate, and that you can see some tire tracks leading from the Lake Herman Road rather than ranking around from the Southwest side of the gate.
Daniel:
Daniel confirms that he was with David and Betty Lou from 5:00 PM to 6:00 PM at the 'Landers' house. This confirms the version of 'Joe' who mentioned that both were at 'David's house. There obviously exists another David named David Landers (p. 44).
Robert Compl:
Robert Compl from Benicia states that he could think of a prowler 'continously watching their house' whom he and his wife could not get rid of. They also saw a blue wagon driving around at night and does he believe that the prowler was a ex friend of his wife (p. 46).
Helen:
Helen states that the car was parked to the Gate at 10:15 PM and that it was parked to the field when they came back at 10:30 PM. She further states that she saw a yellow, brand new foreign car with two passengers, the driver being male, parked near the crime scene (p. 47, 48).
Larry (19yrs):
At 9:00 PM a guy named Larry states that a guy named 'Rat' tried to sell him an automatic rifle, holding a clip of five bullets but able to hold more. He fired a shot into a fence at a residence at the end of Gate Way Drive, near the park. He is actually another guy shooting around out there that night (p. 52).
Mr. Don:
Mr. Don states he saw three young people with one of them holding a gun towards the ground. Their car is described as a small foreign model, white or cream in color. One of those juveniles could eventually have been a weapon dealer who had contacted Larry (p. 53).
Larry (20yrs.) & Linda:
Stated that the 'Pete' who verbally attacked Linda drives a '52 blue Chevrolet Coupe as well as a '55 creme or maroon (BRS phone booth!) Buick. Pete is 28 yrs. old, 5'11'' tall, has jet black hair and acne pits on his face. He is a helper at Kaiser Steel and is working the day shift. If 'Kaiser Steel' is connected to the auto-wrecker Ricky used to go (and his brother-in-law worked at), this Pete could be our new suspect. And, for what its good, there is a auto speedway behind Kaiser Steel mills in San Bernardino (
http://en.wikipedia.org/wiki/Fontana,_California; (p 59).