I see what you're saying Ivy, but I have to respectfully disagree. I mean the Feds with all their resources and network of informants have mostly been the ones keeping tracks of these family structures. Not to say they haven't been prone to error (especially in the early days, but that's another issue). And they hodl that 3 out of the 5 families have this position. So tehre's that.

And sorry for the way I phrased the blurb about Bellomo. It was kinda confusing. I fixed it above. I meant that he was first an acting boss before transitioning to Street Boss. The Acting role has been in place since time immemorial.