The other bodyguard Calo became the leader of the Sicilian crew of the Corleone family.
Is that really what we are supposed to believe? I mean, Calo appears a little dumb. For example when he just repeats what Fabrizio tells ("more Greek than Italian").
If I recall correctly, the novel describes Calo as being little more than an aminal, intellectually. Hardly leadership material.
Also, GFIII makes clear that he works for Don Thomassino. "My master is dead. Blood calls for blood."
