I saw the picture of the fish and I've read the fbi files. I can't remember all that much except that he was "quick to kill," very brutal. He was apparently a hunting and fishing enthusiast.
Other than the FBI files I haven't found much on Aiuppa.
So much of this information cannot be validated. I don't know how anyone would know for sure what transpired behind closed doors with top echelon members of The Outfit. My guess is a great deal of these interpretations / versions have been handed down and probably distorted and embellished to some degree.
Don't forget he had a hunting retreat five miles from where the Spilotros were buried.
The Outfit knocked down a TON of people in the 70s and 80s.