When experts have a recollection of a significant event those statements stand as a facts in the same objective manner as everyone else with equal credibility as a witness So when you said the Z film Brugioni saw was not the film we see later you are either caught up in a semantic fallacy or simply positing that witness accounts are open for your personal contextualization
You seem to be confused. I
never said that "the Z film Brugioni saw was not the film we see later" in any way, shape, or form.
What I am trying to get across is that Brugioni didn't say that he thought the Zapruder film had been altered. That asserrtion is a projection (pun intended, just so you know) generated by the hopefully faithful z-film alterationistas. All he said was that the explosion in frame 313 didn't extend as high up into the frame as he remembered. He was about 90 years old at the time of the interview, and he was trying to recall something that he saw on day 50 years before, so his recall isn't the best evidence for anything. I have pointed out here that, if you do the photogrammetry, the "scatter" (as he called it) in the existent frame reaches a good 40" above the top of JFK's head, which places it in the 3'-4' range that Dino remembered. I also advanced, for the sake of argument, two entirely reasonable explanations that would explain why he remembered that particular image a certain way without needing to rely on alteration. They seem to be reasonable enough that nobody has objected to them. To me, it's significant that he doesn't seem to have an issue with
what is in the image rather than
where it is.
You are correct that Bruglioni's statement is itself a fact. I mean, Janney recorded it! But that's not the point here. The point is whether his memory would be sharp enough for it to be considered a significant factor 50 years after the fact. Some might want to believe that it would be so, but I wouldn't count on it.