pmac, I would have to disagree. When Vito was out of jail they were a well known power. The only time bodies start to drop is when the leaders were/are in jail or prison. They didn't even hit Rocco Sollecito until Stefano and Leonardo Rizzuto were behind bars. Same for these attacks.
I think Stefano lost a ton of power once his father died. Leonardo might be in trouble now unless he gets out with a good bit of power as well. We'll see soon enough.