Dan, I am just quoting the z190-z224 range from the Pat Speers excerpt that you quoted in your reply post on November 02, 2020, 12:39:46 PM (#152). The author stated that the witness evidence was consistent with a shot as early as z195. Are you not relying on the same witnesses? Or did you find some that Speers missed?
The majority of the witness statements regarding the shots fall within the z190-z224 range.
However, the first shot occurred at a specific frame within the z190-z224 range.
The beauty of the Tyler/Speer evidence is that it relates to a very specific moment - just after both the VP and VP security cars have completed the turn off Houston onto Elm St - and that this moment can be compared to Z-frames.
At z195 the VP security car is still the process of turning and, as such, z195 can be ruled out as the moment of the first shot.
It comes as no surprise to me, after the multitude of arguments I have presented in this thread for a first shot at z223, that mine is the only theory supported by the Tyler/Speer evidence.
And no, I didn't come up with any witnesses Pat Speer had missed. I don't think anyone has.