I think the First shot might've been fired around the same time as the first splice on the Zapruder film
What “splice” are you referring to?
What, are you gonna try to convince me the first shot was fired after Kennedy starts waving again?
Do you mean after he began waving for the last time, which, as Mary Woodward said, was before the first “horrible, ear-shattering noise”? And after Betzner’s z186 photo, which he said was just before the first shot? And after the VP car completed the turn as all its occupants said? (the VP car is almost finished turning at z180 when last seen in the zfilm).
After the little girl in the background stops running?
Rosemary Willis said she stopped when she heard the first shot. Her feet stopped at z199. The first shot was not after that, according to her.
After Connally turns around?
He turns “around” only once - z230-270. The first shot was before that.