JC-
Thanks for your cordial inquiry.
My layman's view of the Z-film is Gov. JBC shot at ~Z-295 and JFK at Z-313.
Connally: I was knocked over, just doubled over by the force of the bullet. It went in my back and came out my chest about 2 inches below and the left of my right nipple. The force of the bullet drove my body over almost double and when I looked, immediately I could see I was just drenched with blood. (1 HSCA 42)
JBC is pushed forward ~Z-295.
This sequence also lines up with the "bang...bang-bang" cadence attested to by many witnesses (Kellerman shots came in a "flurry" or "on top of each other,' and many others).
There is also the observable and indisputable fact that JBC makes a 180-degree turn in his seat after JFK is apparently shot in the back ~Z-220.
Under SBT, that means, after having been shot through the chest, having his right wrist fractured, and the slug burrowed into his leg...only then JBC makes 180-degree turn in his seat to check on JFK.
And that JBC only imagined he was pushed forward by the slug that struck him in the back. Although he is indisputably seen being pushed forward ~Z-295.
The smoke-and-bang show on the GK is another interesting apparition, seen and heard by many. It may have been a diversion.
All that said, I suspect the JFKA was the work of a very small group, possibly Alpha 66 Dallas residents, and included LHO, or G2 assets. Those same residents may have worked with LHO on the Walker shooting attempt or intentional miss.
The Warren Commission was not interested in following leads, either into G2 and KGB, or into CIA assets in the US. G2 also also penetrated CIA Cuban assets in the US.
The LN narrative was settled on rather soon, and the FBI carried out most investigative work.
There were two guys in the State Department whose careers were ended as they wanted to follow up G2 leads, including the US Ambassador to Mexico.
But if the JFKA conspiracy involved more than three or four people, I would be surprised.
LHO, another gunsel behind JFK, and the GK diversion guy.