When they charged rizzuto in the 3 captains murder in 2004 Vitale was the only eyeball witness( at the time) and the fact that he could be placed in NYC the day after. Rizzuto was charged with 1 count of racketeer murder and nothing else like the Bonannos he was charged with. Difronzo on the other hand had one eyeball witness and could be placed in chicago area that day of the spilotro brothers murder so why not go after him on the one murder(actually two) as well I believe They could have. Marcello was only convicted in one murder. I believe there was political intervention.