I wouldn't rule that out. The brutality of the hit is typical Canadian. There's a war going on in Ontario now and the Gambinos are active over there and they seemed to have played a role in the Montreal mob war too. Perhaps Cali was stirring things up over there and some of the groups there had enough of it and wanted to make a statement. The old Rizzuto group might be desperate enough to pull off something like this with all the hits they endured themselves with New York most likely sanctioning these attacks since they are all part of the same organization (LCN). Perhaps they felt they had nothing to lose. Just thinking out loud here.

There's no denying how similar this hit is with many in Montreal and now in Hamilton. Mobsters getting killed in front of their home seems to be the norm there nowadays.