In other words, while its somewhat interesting to a degree....maybe we're not supposed to fret about all this 'background' logic in order to enjoy the films.
Yes, much of this is borrowed from real life organized crime history...but overall, the characters themselves are still works of fiction.
I'll say one thing, though...wondering how Michael didn't know Frankie was alive is a helluva bit more compelling a topic than why wasn't anybody crying at Vito's funeral.
Apple