I only got two things to say
1. Couldn't Altobello have been the head of the sixth family? Then that family would have been a neutral family, IMO.
2. I have stated this before, but I still can't figure out why no one has asked
Mario Puzo all of this. The film came out in 1972, the man died in 1999. There must have been a GF-passionate journalist who interviewed him and asked all the difficult things like this.
And besides, you guys and TB must have been GF-geeks back then too, and I bet you were also thinking about this 'problem' in those days. So why didn't any of you kidnap Puzo and beat the hell out of him to make him talk?