Sorry to backtrack, Spitfire, but I wanted to follow up on a previous post regarding the Zapruder film while I think of it. I'll address the recent posts afterwards.

In post #279, you said that...

Connally was hit about z223, one frame before his lapel flips.

So when do you think JFK was hit? I assume you would have to place it at around z221 or so? That is, during the time JFK was hidden from view by the sign. But it appears to me that he is already reacting to a bullet by z205 to z207, when he has turned his head to face forward.

Don Olson and Ralph Turner wrote an article, "Photographic Evidence and
the Assassination of President John F. Kennedy.". published in the Oct. 1971 issue of the Journal of Forensic Sciences. They noted that JFK is reacting to a shot at about z200.

The HSCA came to the same conclusion in their report...

By Zapruder frame 207, when President Kennedy is seen going behind a sign that obstructed Zapruder’s view, he appears to be reacting to a severe external stimulus. This reaction is first indicated in the vicinity of frame 200 of the Zapruder film. The President’s right hand freezes in the midst of a waving motion, followed by a rapid leftward movement of his head. There is, therefore, photographic evidence of a shot striking the President by this time.(HSCA Report and Vol. 6:17)

That would make the SBT impossible due to the length of time between JFK being hit and Connally being hit...