I’ve wondered for a while if Zapruder... and now Sitzman... were present with cameras mostly to document the dirty deed... mostly to identify who might have been on the scene taking photos or filming action taking place on the grassy knoll... behind the wall and fence, etc...
Perhaps Zapruder’s story of having to be reminded to take his camera is a made-up story for the purpose of protecting him from the accusation that he was part of the plot...
And perhaps Time/Life’s purchase of full rights to Zapruder’s film and then “sitting” on it for over a decade, was part of the plot as well...
The larger the conspiracy, the fewer the actors who can be trusted... from law enforcement on down... from the White House on down...