Just look at the charts Ivy posted: a lot of guys died the last ten years. Who knows if, and if so by who they are being replaced? We get information when someone rats etc., but for a secretive, relatively rat free family like the Genovese, there's still some guys off the radar.
The NY families allow each other to replace those members that have died. But you're not allowed to replace any that flipped. They also traditionally made two extra guys at Christmas time but I don't know if they still do that.
And obviously, just because there may be several guys not on those charts, that doesn't mean they are off the FBI's radar. For the three smaller NY families, I think Pogo's charts are pretty close considering the official estimates for them are a little over 100 made guys each.
