Definately Luca.
The movie itself shows absolutely no background on this man, one of, if not the, most powerful assets to The Corleone family. While the movie hints that Vito had used him in the past for the serious assignments, the book gives us a little more insight into the character and his background. Yes, I definately would have liked to see Luca on at least one other assignement from the Don before he was killed.


Don Cardi cool



Don Cardi cool

Five - ten years from now, they're gonna wish there was American Cosa Nostra. Five - ten years from now, they're gonna miss John Gotti.