I was just watching an old interview of Buddy McGirt last night, where he was asked by a report how Golov fares against some past greats. First thing he said, "You know who would knock Golovkin out? Carlos Monzon." Then Buddy said that Golovkin wouldn't even beat Briscoe, let alone Monzon.
Not that's he's wrong or could ever be proven to be, but he also said Vincent Releford was the strongest and best puncher he ever faced. He's said a whole lot of things.