Holyfield himself was a cruiser when it was 190 pounds. Wilder is the lightest HW title holder for years and has said himself he's tempted to drain down to 200. Povetkin struggled with Huck. Tyson struggled with Holyfield Fury struggled with Cunningham Vitali struggled with Byrd Lewis struggled with Holyfield Joshua is still a bit of an unknown but I favour him also. Ortiz is hard to say. Wlad is a clear favourite over any sub 200 fighter as his style is unbeatable against smaller guys. If we force any of the past champs to give away 50 pounds they're going to struggle and be at a disadvantage. I'm sure most would bulk up for the occasion as Holyfield did and anyone else who moved from CW in modern times. As a career Rocky is best suited at LHW or CW, but at the culmination of that career as a one off fight if he's weighing 215, it wouldn't be the biggest upset in history if he clocked the reigning champ.