Answer this, when do you believe Hamilton stopped answering to Buffalo? This will answer all your speculation you have.
Sorry, but could you give any more insight into the Cohen arrest? E.g. what was he arrested for, news articles on the bust. Also, what are the other busts you mentioned?
I have not seen evidence of a Buffalo-Canada connection in over 20 years. Probably ended with the assassination of Johnny Pops Papalia.