Groden Inadvertently Proves his Zapruder Copy is a forgery; the 2 NPIC Z-Film Events

In short there were two film processing events at the CIA's National Photographic Interpretation Center "NPIC."
The first:
On Saturday Night at 10 pm the day after JFK's murder, Dino Brugioni received and processed an 8 mm roll of film from Zapruder, to make blowout pictures from the frames and put them in a binder for the CIA to do presentations with. If was 8 mm, slit rolls which, as the video explains, means that the roll is filmed in the camera in two strips wide, you film the front of one side then flip it around and film on what was the backside of the other strip: that camera strip is 16mm. It's slit in half into the two 8mm strips, which are then joined together "long ways" end-to-end to make one continuous rolls that can be run on 8mm projectors.
Dino had to buy a projector, they didn't have any since they probably get 16mm double-wides normally before they're slit.
Event 2:
The following night, a different film is brought into NPIC and a differnt crew, led by Homer McMahan, makes the blowup pictures for it. It was a double-wide, 16mm unslit film.
The two events were compartmentalized and Brugioni never saw Mcahan's work until Horne showed him, decades after. He says it's not the same roll, things are missing.
Groden challenges this and he's wrong: not maybe-wrong, not as "a matter of interpretation", but black-and-white wrong on multiple fronts. He says Brugioni can't have received an 8mm copy, since Groden's is 16mm unslit, it must be the original and Brugioni's must have come later. But this reasoning would only be true if Brugioni's and McMahan's/Groden's/the current "extant" film were both the same film. They're not, and Burgioni is saying they're not. Therefor, Groden is making a fallacious argument.
Furthermore, the film was slit in Dallas, as per the ARRB testimony from 3 Jamieson lab techs in Roland Zavada's analysis. Zavada tried to roll this back using a circular model that assumes no alteration, therefor shows the two films are the same and Brugioni's isn't altered. This is also fallacious, and unrelated to his expertise as a photo developer. Zavada is not a professor of philosophy, logic or behaviorism. He's a Kodak guy. More importantly, it was not his testimony that the film was slit in Dallas.
McMahan, Gruder's and all other currently available films are from the 16mm version, which Brugioni testified to ARRB was altered at CIA's state-of-the-art photoshop Hawkeye Works.
Zapruder TL

*FRI 11/22*
12:30
shots
12:40
meets Journo and tells him
journo brings SS sorrels to zap office at Dal-Tech
2:41
they take it in the limo w/ z. "partner" shwartz to Dallas Kodak center, after several local places can't do it.
Shwartz had Z's camera bag over his shoulder, someone says on Quora.
~4:00
film made w/ 3 copies from Jamieson
~6:00 PM or "shortly after"
-makes initial deal w/ LIFE for 50k
-gives two copies to Sorrels, keeps 1 and OG
-watches either with wife and/or daughter that night

*SATURDAY 11/23*
0300 (AM)
SS rcv's one of the copies
Morning/EARLY AFTERNOON
-makes final deal w/ LIFE for $150k
-give LIFE OG & all copies
LATE AFTERNOON
-LIFE "makes arrangements" to send to DC for gov analysis
10:00 PM
Dino Brugioni Receives it

*SUNDAY 11/24*
Smith fellow surreptitiously gives forgery to Homer
its again double wide , as the og was before they slit it in Dallas

LIFE sells it back to him for a dollar in 1975, after Groden plays his pirated version on Geraldo. Then the Gov pays his family 16 MILLION for it in 1999, but astonishingly decides NOT to pay an additional 2 million to acquire the rights, which is why the Oswald Did It Museum still has the rights.
Did zapruder really keep the copy all that time, that I don't know.