Because I dont have any evidence regarding Colosimo being representative for the SICILIAN Mafia. We have information regarding he and Torrio being connected to Merlo, and possibly with his predecessor D'Andrea too. Both Colosimo and Torrio probably belonged to a different group aka the Camorra, which means that neither of them were ever considered as official reps for the national Sicilian network, although they were 100% partners/associates of the Sicilians. We have Diamond Joe Esposito being made by the Sicilians, but he also was never a official rep. Later everything changed with Capone and Joe the Boss Masseria.