Seems to be a revenge killing that could be related back to Vito Rizzuto's return in 2012.
I think you're right. I also think that a lot of the murders during certain periods of the war are revenge killings. Which could mean more retaliatory attacks, a recent example of which might be the two attacks on Solid Gold, which was Moreno Gallo's old stomping grounds; other future retaliatory attacks, of course, would be more murders that have yet to be avenged. The guys in Montreal often seem ready to pull the trigger and to avenge murders relatively quickly or at least when the opportunity presents itself (which may mean a few years later).