No one here implied Luca was the focal point of the stories but that doesnt mean a Capo or soldari with the last name Brasi or knowledge of his father with the whores last name. Any movie is a grasp at a straw and until you see it and decide its quality. no movie is guaranteed
I think that GF4 could be an engaging look at the fall of americas most prominent family. If you go back and read some of the real history of the mafia i think it offers endless storylines, with the changing of the guards in New York whos to say that the Corrleones final powerplay will be returning to claim there territory in new york through Clemenzas family