Over eighty witnesses provided evidence that is inconsistent with a shot at that point. Even Croft said his photo was not only before the first shot, but he had time to wind his camera and get ready to take another before the first shot.
"Evidence," my you-know-what.
The first shot at "Z-124" sounded different from the other two, probably because the muzzle of Oswald's short-rifle was inside the building for the steeply-downward-angled shot when he fired it.
A lot of people thought it was just another motorcycle backfire, or a firecracker, or even a tire blowout. That, and the fact that Dealy Plaza is an echo chamber, threw off a lot of people. Unfortunately, eighty of them provided their mistaken opinions.
So, your insistence that they were all independently, wrong but mutually consistent with each other because you can read Jackie's face in the Croft photo is difficult to understand.
Is English your second language?
In any event, face reading is not a science and is nothing more than speculation with zero evidentiary or persuasive value.
You said the reason Jackie turned her head far to her left between Z-145 and Z-161 is because "she was acknowledging the crowd."
If that was the case, why wasn't she smiling and/or waving in the Robert Croft photo?
Why did she look so concerned?
IF Secret Service Agent George Hickey was leaning over the side of the car [between Z-150 and Z-170], it must have been to get a better look at something unrelated to a rifle shot, possibly people who were standing in the roadway.
I guess you haven't seen how far down he was leaning in Z-160.
Maybe he was barfing, or picking up some litter, right?
https://assassinationresearch.com/zfilm/z160.jpg