No, it does not. I understand there are fans of the “Oswald did it” crowd who explain it away by the “jet effect” but I don’t believe it would have caused that much movement. Although the “jet effect” does exist, in other words, some object such as a gelatin filled human skull have jumped forward toward the shooter, the effect appears to be minimal.
There are doctors who have testified that there is no way of predicting which way a body will jump after a head shot. Some snipers in Viet Nam had reported head shot victims would tear up the landscape like headless chickens.
I can only give an opinion on this. Kennedy had a flap of skin fall directly into his face. That’s on the Zapruder film. I believe for a split second he reacted to that as Mrs. Kennedy and Connelly also reacted rather violently to what Prairie Dog Hunters decribe as “red mist”.
Bottom line is Kennedy’s head was pushed forward 2.3 inches from one movie frame to another on impact. Zapruder’s Bell and Howell filmed at, calculated at the assumed speed of 18.3 frames per second, equals .055 seconds (or 55 milliseconds).
You’re a good man Shooter. I appreciate your efforts to help me understand.