So which conspiracy theory is it? Was he working for JFK or was he passing ammo to Oswald while nagging him in schoolbook depository in Dallas?
"I wouldn't be using that Carcano Carbine there, not a reliable weapon, It's bad, BAD! Wouldn't be prudent at this juncture here."
There is a particularly unpleasant writer/biographer who found the CIA’s George Bush memo to Hoover regarding his whereabouts during JFK’s trip to Dallas in the FBI’s SoCal offices.
Google is still our friend in some aspects...
Most JFK murder conspiracy researchers have Zapata down at ground level at Daley Plaza,......not upstairs passing ammo to Oswald (the patsy).