“Payback by the trainers (CIA), friends and family of Brigada Asalto 2506 because he lost his nerve and left them to be killed and captured on the beach.”
BINGO! And there’s a death bed confession of one of the assassins confirming this a few years ago. However, pinpointing the actual shooters while overlooking the dozen+ dedicated men that would have been honored to do the deed is not revealing, in itself.
Knowing the agency handlers, the depth of the plan and all the sweepers would serve a greater purpose.