Surprised you showed up here, Jerry, but not surprised you've completely ignored the latest evidence I've provided to support a first shot at z223.
All 10 occupants of the VP car and VP follow-up car are in agreement on this single point - that both cars have completed the turn off Houston and are travelling on Elm Street.
All 10 statements corroborate each other on this point.
You're theory (which I've catered for) is a first shot around z160. Let's have a look at Mark Tyler's mapping program for around z160:
As we can see, the VP car (#7) has not fully completed it's turn onto Elm St. and the VP follow-up car (#8) is still on Houston St.
This positioning for a first shot is completely refuted by the witness statements of ALL 10 OCCUPANTS of the two vehicles.
A first shot around z160 is completely refuted by this evidence.
If you feel there is a glaring weakness with the evidence I've used or the methodology I've used I would like to discuss it.
If you don't believe there is any weakness, isn't this the kind of solid evidence that should be informing your opinion about when the first shot occurred?
Are you just going to carry on believing the same thing, even when confronted by such evidence?
Surely it's the evidence that should be informing your opinion.
Surely that is the bedrock of wanting to know what really happened that day in Dealey Plaza.
I think you're assuming the car occupants would be staring directly out the vehicle's front window and only be aware of what's in the immediate front of the car. Instead, I believe they were more likely to be anticipating where their car was headed or be looking towards the Presidential limousine and how the crowd was receiving the President.
Lady Bird Johnson says her car was "rounding a curve" at the moment of the first shot. By Z223 the VP car is well pass the curve.
Clifton C. Carter said his car was "right along side of the Texas School Book Depository" when he heard the first shot. Since his statement was made in May 1964, and he morphed events, it may have been the second shot (not the first) that he heard when his car was alongside the Depository.
"At approximately 12:30 p.m., our car had just made the lefthand turn off
Houston onto Elm Street and was right along side of the Texas School
Book Depository Building when I heard a noise which sounded like a
firecracker. Special Agent Youngblood, who was seated on the righthand
side of the front seat of Vice President Johnson's car immediately turned
and pushed Vice President Johnson down and in the same motion vaulted
over the seat and covered the Vice President with his body. At that instant
Mrs. Johnson and Senator Yarborough, who were riding in the back seat
along with the Vice President, bent forward. Special Agent Youngblood's
action came immediately after the first shot and before the succeeding shots.
I distinctly remember three shots. There was an interval of approximately
5 to 6 seconds from the first to the last shot, and the three shots were
evenly spaced."
I don't think Youngblood got over the front seat between shots 1 and 2. I think Carter filled in some of what he saw with regards to Youngblood from news reports that exaggerated Youngblood's reactions.
Agents Johns heard "two shots" -- so his "first" shot could have been the Z220s SBT shot (the 2nd of most LN scenarios). Agent Jacks' vehicle isn't absolutely "straightened up from making the left turn" at Z160, but he said he was looking "looking directly at the President's car at that time". So his line-of-sight was down Elm; at Z160, the vehicle Jacks was in was perpendicular to Houston and more on Elm than Houston.
While I don't believe T.E. Moore was well-placed to assess how even the President was with the Thornton Frwy sign, he saw enough, in my opinion, to believe the limousine had yet to pass the Thornton Frwy sign when the first shot sounded. At Z223, the limousine's rear bumper is a car length beyond the Thornton Frwy sign. As well, agents John Ready and William McIntyre -- whom were on the Secret Service "Queen Mary" car that was immediately behind the Presidential limousine -- seemed to indicate the limousine had yet to reach the Thornton Frwy sign when they heard the first shot.
"At about 12:30 p.m. we began the approach to the Thornton Freeway traveling
about 20-25 MPH in a slight incline. I was about 25-30 feet from President
Kennedy who was located in the right rear seat. I heard what appeared to be
fire crackers going off from my position. I immediately turned to my right rear
trying to locate the source but was not able to determine the exact location."
— John Ready
"Directly in front of us was an underpass with a green sign with white
lettering, stating "Entering Thornton Freeway. The Presidential vehicle was
approximately 200 feet from the underpass when the first shot was fired,
followed in quick succession by two more."
...
As we approached the underpass leading to the Thornton Freeway, there was
little, if any crowd present. I heard three shots fired and observing the President,
noticed that he had been struck by at least one bullet, I thought in the head."
— William T. McIntyre
I know they don't specifically describe the Thornton Frwy sign, but what else could it be?
And there's Rosemary Willis, the girl in the red dress, running smartly along the limousine in Z160 who comes to a full stop by about Z189. She said she had been running when she heard the first shot, which caused her to stop. She's stopped almost two seconds before Z223; if we allow most of two seconds for Willis to perceive the sound and bring herself to a stop, then she heard the first shot over three seconds before Z223.