Attempting to dismiss the eyewitness statements to promote an oddball understanding of the shot sequence seems pointless. It would be akin to someone being unable to recount a 5 second event that just occurred. With this form of reasoning nothing anyone ever says can be taken to be true. The first shot struck JFK. The time frame is approximately 5 seconds nothing more. Bronson and Zapruder films thow the location of the eyewitnesses standing grouped in a line along the street. They state where the location of the first shot occurred.
There is no reason to guess, the location of the first shot can be located with the statements of the eyewitnesses. The Chisms said it happened right before JFK reached them, Jean Newman said it happened right after it had passed her, and Calavary, Hicks, and Westbrook stated it happened in front of them. Mary Woodward stated the first shot did not happen until JFK turned to face forward after he had passed them, which doesn't occur until after Z204.
John Chism : "And just as he got just about in front of me, he turned and waved at the crowd on this side of the street, the right side; at this point I heard what sounded like one shot,"
Jean Newman : "The motorcade had just passed me when I heard that I thought was a firecracker at first, and the President had just passed me, because after he had just passed, there was a loud report"
The TSBD Secretaries
Gloria Calvery : "The car he was in was almost directly in front of where I was Standing when I heard the first shot."
Karan Hicks : "The car he was in was almost directly in front Of whero I was standing when I heard the first explosion. I did not immediately recognize this sound as a gunshot"
Karen Westbrook : "The car he was in was almost directly in front of where I was standing when I heard the first explosion. I did not immediately recognize this sound as a gun shot ."
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Woodward said the earsplitting noise happened after JFK turned forward and not before. JFK does not turn forward until Z204+
Mary Woodward
"After acknowledging our cheers, he [JFK] faced forward again and suddenly there was a horrible, ear-splitting noise coming from behind us and a little to the right."