Frank Desimone became the boss of the Los Angeles Family and never personally clipped anyone either. There was also a rumor that Angelo Bruno never personally killed anyone. It's an exaggeration to say that someone has to kill someone else to get made. The Mob also made people in certain respected occupations who never killed but had certain skills that were useful to organized crime families. Also, members and associates get "credit" for killings even if they didn't pull the trigger, like planners, drivers, lookouts, clean-up, etc.