It wouldnt suprise me if Vinny did it on the sneak. According to Cicale and other turncoats, along with breaking numerous rules like bringing a gun to a meeting with a made guy, saying he was going to "level the Bronx" which is a reference to Basciano, demanding to get made, saying in public he was one of the only hitters in the borgata, Pizzolo apparently was also mouthing off about hitting Nick Cirillo and thus in a rush to hush him he was ordered whacked out by Basciano.