I don't think the authorities would go out of the way to re-arrest Del Balso after Sollecito is killed for his own safety, if they thought this came from Arcadi, Del Balso is rumored to be a part of the Arcadi group. I still stand by my opinion that this isn't retaliation, but a removal of the old leaders. And if we're to believe those who could've stood in Arcadi's way are all dead or in jail, that's wrong. There are still parties who were allied with Leonardo Rizzuto and Stefano Sollecito who are on the street. And just to play advocate to the Arcadi angle. According to Nicaso and Peter Edwards, whom would know more about these things than we do, Arcadi was losing allies within the Montreal Mafia prior to his arrest after Operation Colisee because he was getting "too close" with the Calabrians.

But hey, we'll see.