You're missing the point Jack.
How could a shot from the front cause the flap of scalp to be hinged from the front of JFK's head. Why isn't the 'hinge' of this flap of scalp towards the back of his head?
You missed my point Dan. The flap on the right temple blow out was caused by a shot from the knoll, not the front. Besides, the hinge has nothing to do with where the shot came from. The hinge represents the strongest part the skull at the point of the blow out, and is not related to the direction of the shot. Why do you think otherwise?
Here is frame 323 and the damage caused by the near simultaneous knoll and frontal shots (minus the fist-sized hole at the back of the head):
A FMJ bullet does not do this kind of damage. Frangible bullets, however, do.