A problem with the headline news about Jack Ruby and the JFK Files and an FBI informant

What follows is Jack Ruby’s movements from three hours before the assassination until an hour after the murder itself.   It is from pages 411-12 of Case Closed: Lee Harvey Oswald and the Assassination of JFK (Random House, 1993) and is based on contemporaneous FBI interviews of witnesses at the Dallas Morning News, as well as some of their subsequent testimony to the Warren Commission,  (all citations are listed in Case Closed)
The unequivocal conclusion: Jack Ruby was in the se...