Yup, sorry, it was originally about the records building and I called it the jail and courthouse.
Not sure why you asked if I thought the whole Z film was a hoax. My point was the image near the sprocket is not an image of a gunman on any of the buildings mentioned. At frame 481 there is no way for any image from those buildings to end up on film. even when you consider light rays entering by bouncing off the end of the lens housing, that light source(The records building) could be no more than 90 degrees away from Z's line of sight to frame 481. After that there is no path for light from there too make its way into the camera.
If you draw a line representing Z's line of sight from the pedestal to the limo position in frame 481(basically the underpass), then draw a line at Z's location that is perpendicular to the first line it will denote what was 90 degrees off from Z's line of sight at frame 481. Any position west of that 2nd line(Less than 90 degrees) could conceivably hit the lens housing and bounce its way onto the film. But everything east of that line(more than 90 degrees) has no path to the lens at all. That 2nd line extends from the pedestal to the south peristyle between Main and Commerce. Any light source East of that has no path to enter the camera.
But I think the even greater problem is the fact that while the shooter image stays in the same place as the camera pans almost 180 degrees, every other object recorded moves across the screen as Z panned right. even if the shooter image was from a stray reflection bouncing into the camera it would be impossible for it to remain stationary.