Someone who doesn’t get some credit for Cosa Nostra is Salvatore Maranzano.

Sure he tried to be the boss of all bosses and got killed by the new generation of gangsters.
But he still the one who create the 5 families of NY. And those families are still there.
Also, ***I don’t know if I’m wrong on this *** but was he also the one who decide what would be the ranks in Cosa Nostra and the difference between the American Cosa Nostra and the Sicilian Mafia ?

But I think, because Salvatore Maranzano was killed because he was so old school and was the bad guy in the history of Lucky Luciano, he get put out of his impact on Cosa Nostra.