you are over complicating things. dont make broad assumptions,i think your on the right track but youve read to much crime fiction novels or something.
So, you're saying that a guy who's father is Italian and mother is for example Irish will not get made?
This is what he said - i think your reading to much into this. you need to be 100 percent italian to be made. that is 'the rule'. the fact that the rules arent followed is a completely different subject all together.
The last sentence answers your question