Callum will blow The Gorilla away IMO. Too big and strong. BJS will never go toe-to-toe. He is a pure boxer (I loved the Lemieux bout) and now his strength and conditioning is done by Dom Ingle (who loves to do 'bodybuilding' and has his team 'bodybuilding'), then I'm sure his stamina issues are sorted . I really rate BJS and want him to fight GGG or Canelo.