I don’t know about the theories and all of that. What I do know is that with my own eyes I’ve seen the Zapruder film at least a 1,000 times in the last 35 years and every time I watch it, JFK’s head violently snaps backwards and to the left from the fatal shot.
Since Oswald was above him and behind him to the right, would not a fatal head shot from Oswald have snapped JFK’s head forward in a down angle and to the left?
I mean, I’m no physicist and I’m no doctor, but I have some common sense and I’ve yet to hear a credible explanation as to how a shot from behind and above can cause the head to violently snap backwards and upwards. I doesn’t make sense.
Look at the forward movement from the bullet impact on post 45. That is the initial movement. The solid proof of this is Equal and Opposite Force. Bullets don't push objects with the amount of force exhibited in the back and to the left. A bullet would push someone's head the 2.3 inches in the gif.
Further proof is the autopsy report. The bullet wound at the back of the head was the size of the bullet. The exit wound was much larger. Small hole in, large hole out. The rear bullet wound also was cratered. It's as though a bb hits a glass window with the larger size on the inside.
There's also the two bullet fragments. They came from the Carcano and one hit the inside of the windshield near the rearview mirror and the other hit the inside window trim. One was found on the front seat and the other on the front floorboard.