yes you are correct my bad, It was under Joe Bonannos reign of his preference for Sicilian membership although he inherited members from other groups during the formation of the 5 families. I do not know what year massino was inducted (74?) Joe Massino is Neopolitan.
A great many of the earlier powers in the family were not only pure Sicilian but Joe preferred familial ties going back to Castellamare De Golfo. Cesar Bonventre was actually a nephew of Joe Bonanno and 2nd cousin to Bill Bonanno, The family history is in Bonannos book 'A man of Honor'