I wonder how long it'll be before the rest of the sealed records are released on the Kennedy assassination - and the subsequent cover up.
The only explanation that ever accounted for all of the shots, all of the forensic evidence, as well as explaining the missing evidence, like Kennedy's brain full of fragments that could be metallurgically match with or excluded from the rounds fired by Oswald is the theory put forward by Howard Donahue and Bonar Meninger in "Mortal Error" and Colin McLaren in "JFK, the Smoking Gun".
In short, the theory holds that rookie Secret Service Agent George Hinkey slipped while climbing on the back seat of the car behind Kennedy's limo in the motorcade. In the process he had a negligent discharge with an AR-15 firing soft point .223 ammunition, which struck Kennedy in the back of the head.
It does all of the following:
1) it explains the impossibly short timing between the second and third shots;
2) it demonstrates that the .223 bullet fired by the AR-15 is 100% consistent with the wound in Kennedy's and the numerous small fragments visible on the X-ray (which would not have happened with the FMJ 6.5 Carcano round);
3) it explains the secret service agent in charge stating "there has been an accident" to Bobby Kennedy (the attorney general at the time) during a call at Parkland Hospital;
4) it explains the insistence of the Secret Service to remove the body from Parkland Hospital prior to an autopsy;
5) it explains the hurried autopsy that was done as well as the excessive direction and intimidation by secret service staff controlling what could and could not be done as well as confiscating all the notes from the autopsy;
6) it explains the missing evidence, such as the autopsy notes, and Kennedy's brain (which contained fragments that could have been matched to the .223 Remington ammo used by the Secret Service, as well as missing footage and pictures by witnesses in Dealy plaza that were never returned or shown in any of the Warren report proceedings;
7) it explains the inconsistency in statements from secret service agents over time, and the complete absence of a statement form Hickey in the Warren report;
8) it explains all the witnesses who smelled gun smoke and/or observed gun smoke at street level and/or reported a gun shot at street level, rather than 5 stories above street level.
It also conforms to Occam's razor by providing the simplest and most straight forward explanation for all the facts with no need for impossible physics and ballistics, or complex conspiracy theories - other than a cover up intended to prevent the public from thinking that Kennedy's death was tragic accident. The irony is that the wound to Kennedy's neck would have almost certainly been fatal, but that wasn't known at the time the coverup was initiated.