I just dont see it. Korobov cant stop people several levels under GGG, even if he gets them hurt. He gasses after 4 rounds. He doesnt move enough. He is a decent fighter to be sure, but beating Golovkin seems like an awfully long shot.
Korobov would not fare well against GGG. He is technically sound but gases out early in fights and is a spent force right around the time GGG gets his rhythm going. By the mid rounds it would be a slaughter. Korobov would lose to Kid Chocolate but the fight would be more entertaining and the Russian would have a puncher's chance.
Ok, OP, we get that your are Russian and want your countrymen to rise above Kazakh GGG but relax, he is there for a long time.