Altobello was an exercise in creationism just like Vinnie and Zasa were. One can imagine any back story one wants, but why complicate it? Why not stay with a story that is more likely? Why bring Sicily into it? If he was Connie's Godfather, then he must have been close to Vito from the early days. Maybe he became a Don of one of the five families. What's a more intriguing question is why he turned on Michael.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."