Could be mistaken, but I think Dellacroce was under Rava during Anastasia's reign, as was Carmine Fatico. Once Rava died, his crew was split up and the remainder of guys went with Dellacroce or Fatico. That's how they became captains.
It was always said once Anastasia became boss; He promoted Dellacroce to captain of his own crew around the same time. It makes sense because they were very close. I may have been misinformed, however.
