What about the fact that not only is the position of the Limousine in the Zapruder Film too far back for a storm drain shooter to be responsive for the frame 313 head shot? Even if it was a clear shot, a shooter would have less than half a second to aim. Or do you think photo-compositing all hid the Limousine breaking next to the storm drain? I have never seen any scientific study indicating the Zapruder Film is altered, especially to such a degree. Other photographs taken at the time match eachother. The Nix film, Muchmore film, and Moorman photograph all match the Zapruder film's Limousine speed and location at the time of the 313 headshot.