"In response to Thomas's findings, Michael O'Dell concluded in his report that the prior reports relied on incorrect timelines and made unfounded assumptions that, when corrected, do not support the identification of gunshots on the recording.
In 2003, ABC News aired the results of their investigation of the assassination in a news-documentary program called Peter Jennings Reporting: The Kennedy Assassination Beyond Conspiracy.
Based on computer diagrams and recreations done by Dale K. Myers, ABC News concluded that the sound recordings on the Dictabelt could not have come from Dealey Plaza and that the Police Officer H.B. McLain was correct in his assertions that he had not yet entered Dealey Plaza at the time of the assassination."
i watched this program and i have a pretty good knowledge on how 3d models/simulations work. Dale K. Myers recreated the events on that day to almost exact accuracy using multiple videos with multiple angles to trace where H.B. McLain was during the assassination and the simulation shows that he had not entered the Plaza yet.
maybe you better take a better look at the Zapruder footage. if you watch carefully right before the Kennedy's head flings back there are 2 frames where his head jolts forward. it's a significant jolt right before his head flings back. it's almost as if a bullet hit him from behind that made his head jolt forward. if you don't believe me take a look for yourself...
http://www.john-f-kennedy.net/jfk468.gif
...scientists have proposed the theory the reason his head flung backwards was the result of his skull exploding. the positioning of the exit wound (front, right of his head) supports that theory and i happen to agree with it.
i've never read the Warren Commission report's theory but the special on ABC called "the Kennedy Assassination: Beyond Conspiracy" showed a 3d simulation of how it could've happened. they took into account the body positioning and locations. it's only a magic bullet if both men were facing directly forward with Connelly directly in front of Kennedy like this...
but both men were slightly facing their right side (towards the crowd) and Connelly's seat was a little bit towards the middle of the car. there was a small space between Connelly and the door. put those factors in together and it doesn't seem so much like a magic bullet...
...that 3d simulation was also able to use Connely and Kennedy's wounds as reference points for creating the trajectory of the bullet. they were able to trace the origin of that bullet to........you guess it.......the 6th floor of the Texas School Book Depository.