Not sure why you LNers think that numbers disqualifies a coup. But in a nutshell:
CIA: Allen Dulles (architect of the Big Event), James Angleton (recruited Oswald from the False Defector Program), Richard Helms, George Joannides (who all lied to Congress about what they knew about Oswald before the shooting)
FBI: J.E. Hoover and a few of his minions (Hoover was the defacto Mob boss at the time and Angleton was blackmailing him with a salacious photo)
SS: William Robert Greer (limo driver who slowed the limo down at the turkey shoot point) H. Roy Kellerman (seated next to him)
DPD: J. W. Fritz (lead investigator) with a few stooges, Roscoe White (edited the Zapruder film, the backyard photos and maybe the autopsy photos)
Doctors:The two pathologists who conducted the autopsy on JFK: Commander James Humes (who burned all his notes and performed post mortem surgery on JFK to hide bullet wounds from the front) and Commander J. Thornton Boswell, with assistance from ballistics wound expert Pierre Finck.
VP: Lyndon B. Johnson (was complicit, but reneged on selling out America to Dulles and the 4th Reich, thank goodness for LBJ)
MOB: Carlos Marcello and a few others (there were no lack of mobsters who hated the Kennedys)
I'm sure there are a few more but if you think that's too many to be believable then you are naive to a fault. Dulles was a bloody Nazi and the CIA was a cesspool of corruption. Do you have any doubt that Hoover wasn't corrupt enough? The DPD? The Mob? Get real. Nixon confessed that they were all a bunch of animals.
So yes, oodles and gobs.
In direct contrast with O'Meara's smarter but misguided conspiracy with just a few participants, you've gone the whole hog and thrown everyone including the kitchen sink at your unbelievably massive conspiracy!
For a start it's impossible to believe Hoover collaborating with anyone, much less the mob and why, when and where did they all get together and formulate this nefarious plan and let's not forget that this murder is the most extreme version of treason and each one of them would be subject to the death penalty.
You also have Greer and Kellerman on your list and I can just imagine the job description: "Ok fella's, your mission is to drive into a warzone with a triangulation of sniper's who will be all firing into your Limo, so just slow down and let it happen and oh, BTW don't forget to duck!"
Then the Bethesda doctors miraculously patched a hole in the back of Kennedy's head, "Halleluiah" and performed surgery on a man without a beating heart and made it look like surgery on a man with a beating heart "Halleluiah x2", Wecht your greatest ally rejected Lifton's nonsense of surgery on a dead man, by exposing this silly mistake with basic human physiology of the circulatory system.
And what's in it for the Dallas Police, did any one or ALL of them suddenly have an influx of enormous amounts of money or did they just hate Kennedy so much, they just did for self satisfaction?

JohnM