i'm from montreal. from everything i've read and researched the relationship between montreal and bonanno's in ny basically ended in the early 2000's.
i dont doubt they would want montreal as an asset, i just dont think it really exists anymore. plus like you said, arrests, tougher border crossing i dont think they have that kinda power anymore. and a former acting bonanno boss (sal montagna) was just whacked up here, from what i can tell new york cant really do anything about it