Interesting point about Accardo being made too. Was Paul Ricca made? Was Joey Aiuppa made?
I think Chicago did it differently. I think the making ceremony was much less formal than other east coast families at the time. It was more "You're one of us now. Your loyalties lie with us above all else." And that was it.
The non Italian members if the outfit like Gus Alex and Murray humphries had great power but they could never be the head boss of the organization. An Italian would have the position of ultimate authority. Its like they didn't need a making ceremony. Everybody knew the rules already. They were more into making money than ceremony and tradition at that time. This is just my theory though.