Lol Hollander delete that

nothing in that is right.
If Massari killed Salvatore Scoppa, then who killed Andrea Scoppa? We've seen time and time again in Italian organized crime that when one brother goes, the other or others go too. This just looks more like a Mafia vendetta than the work of a lone, disgruntled hitman. Just saying. And Sal is a piece of shit for not paying what he promised, especially since the guys they killed were some pretty heavy hitters.
More often than not the brothers don't get taken out. Just because one person kills one brother UT doesn't mean they have to to be the ones to kill the other. We don't know who killed Andrea Scoppa but the Rizzutos are the most likely suspects.