We've been through this before. Desjardins was arrested a little over a week after Montagna was murdered, and he was watching his back ever since the attempt on his life. It's not like people snap their fingers and someone gets killed. It takes time and preparation, in the case of high profile hits often months. When Desjardins was arrested it was said that police acted partly because there was a contract on Desjardins head. Obviously investigation on Desjardins was already taking place, but their decision to arrest him might well have been spearheaded because his life was in danger.

Even if the Bonannos have lost control over Montreal, do you think they would hestitate to kill a non-made member for killing one of their made members? It's true that the families in New York have lost much of the esteem they once had, so all the more reason for them not to lose even more face.

Also, you seem to be very sure about who killed Di Maulo.