Legendary boxing promoter Bob Arum has posed a theory which could see Tyson Fury fight Anthony Joshua earlier than expected. Fury has always maintained he will have a rematch with Oleksandr Usyk but Arum reckons that may not happen to bring forward a bout with his fellow Brit. Joshua beat Francis Ngannou in Saudi Arabia in early March to push forward his case of a shot at becoming undisputed heavyweight champion. Fury and Usyk will go head to head for all four belts on May 18 and it is expected that Joshua will eventually fight the winner. Fury says he is contracted to fight Usyk twice before …