Hey Lorenzo, I'm in Columbus too.
I doubt if there will be any Cosa Nostra presence in the casino here. There will probably be drugs and prostitution around the casino though.
As for the Ohio Mafia, it's like this now:
Youngstown: No made guys left that haven't flipped. Still some bookmaking and loansharking going on, but no longer under the Cosa Nostra banner.
Cleveland: Basically a network of a handful of Italian-American criminals, plus their associates. No organized family to speak of, but there are active made guys.
Toledo: Some Detroit family soldiers and their associates apparently still around.