Proof the fatal shot came from somewhere else other then the rear

[Brian Castle]

and then after the shots Chaney basically stops... and is not seen accelerating to the front - nor is he anywhere near the lead car in McIntyre or Bell

Hi David, this is a great sequence here, you can see how unnatural the whole action seems right around the point where the motorcycles on the right pull back and the SS guy starts running for the limo. His first three steps are in rapid-mo and the next couple are in slo-mo, and the bikes are moving at an unnatural speed at that moment...What this shows me is that the alteration of the Z-film was considerably more sophisticated than just the removal of frames. It's also interesting that in the part where the limo "dips", there is a horizontal... "ledge" or something, that starts appearing at the bottom of the picture... it looks like a concrete structure (somewhat), but it's not, there was no such structure between Zapruder and the road.What becomes apparent from this and similar "adjustments" in the evidence, is that Hoover and the FBI sprung into action long before Johnson asked them too. In other words, the record has Johnson discussing with Hoover the logic around having a "communist conspiracy with foreign overtones", and they decided to quash that possibility. But Hoover had already at that point begun adjusting evidence, as if he already knew what the President was going to say and how he was going to look at the situation. One of the earliest corroborative pieces would be Earlene Roberts and both landlords swearing up and down that the Dallas police were at their place just after 1:30. That would be before Oswald's actual arrest. However the official record has Bill Alexander showing up with the warrant a little after 4pm. These photographic alterations we're looking at, are not simple - they take time, they have to be possibly repeated once or twice before they're gotten right... and to do that on an 8-mm film would have taken a bit of expertise and quite a bit of specialized equipment, back in 1963. Brugione is quite clear about the chain of custody in his interview, his job was apparently to make presentation boards but there was another team with perhaps a different purpose from which he was excluded. He talks specifically about seeing a "big chunk" of Kennedy's skull about three to four feet in the air above Kennedy's head, on the reel he worked on - which is of course missing from the public version.