And Vitale was blowing smoke out of his ass with that claim.

I also agree that Arcadi would be dead before becoming boss in Montreal. As Dixie said, a lot of the Rizzuto trouble can be tied into Arcadi's decision making as boss. For example, Vito promoted amicable relationships with the black street gangs for the sake of business and profit. Arcadi simply wanted nothing to do with them and had an old world, bigoted view of things, which only created more enemies. His handling of the Pony Tail De Vito situation, De Vito simply wanted his piece of the pie after coming home from all those years in prison, Arcadi told him to fuck himself and then had his boss murdered.

Arcadi himself lost trust in the organization for basically paving the way for the buddy-buddy relationships that some of Vitos men developed with the 'Ndrangheta, himself being a Calabrian. However, Arcadi still has his loyalists, he'll make some noise, but he'll be ruffling too many feathers with that bid.