WRT someone playing Cohen in the movie, my take is if you’re thinking ‘mob boss’, you’re thinking too high up the chain. Cohen is muscle, an enforcer - big, thuggish, dumb. he thinks he’s Tom Hagen to Trump’s Vito Corleone, but really he’s Henry Hill to Trump’s Paulie Cicero.
Andy Garcia or Robert Downey Jr are both too sharp. You need a lummox for this role.