There is no proof either way about the decavs.
Some say they r a family with 50-60 guys...doubtful others that they r now a crew reporting to the gambinos more likely.
My guesses to their admin were just that I doubt they even have a traditional admin in place.
Since the stango bust no solid intell has come forward or about who the leaders might be.

Also the members of the Marcello family,Pitts Mafia and any other since defunct family may have thought the same years before there respective families ceased to exist. The New Orleans/Marcello family was one of the oldest and well established Mafia groups controlling a vast territory with connections and influence throughout the u.s. and they r gone. The Marcello's by far for a time had more power than the Colombos ever did and through nepotism and neglect they have gone the way of the condor for close to 20 yrs now...with all due respect never say never.