I think it's possible that the 5 Families all have members who are what I like to say 'straight off the boat" from Italy, whether the mainland or Sicily. Whether they're full-blown Italian or Sicilian factions is another matter. But keep in mind that for every Italian or Sicilian they recruit, I think that there's the potential for them to create a faction of their own countrymen and maybe even take control, especially with the dwindling American recruitment pool.