If you haven’t already, I suggest you watch the documentary, JFK Revisited for context.
Shaw, Ferrie, and Bannister are only mentioned briefly and it references that CIA-HSCA memo about Shaw being a “high paid contract source”.
The documentary mostly discusses stuff that has been learned from declassified documents since the 1990s. It doesn’t spend much time rehashing the same stuff from Stone’s 1991 “JFK” film (at least not the 2 hour version which is available to watch now. A longer version will be released next year). I was a bit surprised by how little time they spent on the Garrison/New Orleans stuff given Stone and DiEugenio’s backgrounds.
I’ve read that the film was originally intended to be based on DiEugenio’s Destiny Betrayed book but I’m glad that they went in a different direction with the final product.
FWIW, I personally am not convinced that Shaw was involved with the Kennedy assassination.
How do you connect Shaw with the assassination other than through the Garrison claim that he conspired with Oswald to shoot JFK? Is there another way? Stone and especially DiEugenio are fervent Garrisonites. They have to throw him overboard in order to have an innocent Oswald.
Your problem - and Stone's and DiEugenio's and now Morley's (if I can lump you all together) - is that none of this CIA intrigue explains or is connected to what happened on November 22, 1963. It doesn't explain Oswald's actions and behavior which implicate him in the assassination. I simply don't believe he had curtain rods in that bag. I simply don't believe he was framed for shooting Tippit. I simply don't believe he left the building and work shortly after the shooting because he thought he would have the rest of the day off. And on and on.
Oswald took a lengthy series of actions - before, during, and after - that directly link him to the assassination. Stone and DiEugenio have answers: he was framed, all of the evidence was manufactured, and all of Oswald's actions have innocent explanations. Moreover, all of the evidence for this has been covered up. For over a
century oops, half a century. As the occupant of the White House would say, "Malarkey."
And I don't mean Mrs. Biden.