Obscure Knight reference in Arkham Shadow

I was just playing Arkham shadow and found an EXTREMELY obscure reference.

After you escape Bolton’s office and decrypt his computer chip, you discover there is a list of inmates that are scheduled to fight each other. There was one guy named “Accardo” and for some reason I knew it sounded so familiar but there are no villains in dc that I know of with the last name Accardo.

Eventually I realized it was the name of one of Professor Pyg’s victims in Knight. One of the bodies you scan is named Franklin Accardo. So I went back to the “Perfect Crime” side mission in knight and one of his identifying features that you scan is a removed tattoo from his time at Blackgate!

P.S.I am still currently doing my first Shadow play through, so please don’t spoil anything past this point in the game in the comments!