Tbh, I'd say all of those guys bar Witherspoon are worse than the guys today. Pinklon Thomas & Tony Tubbs are two of the worst HW champs of all time IMO, I'd expect Wlad & Vitali to comfortably beat everyone on that list & Haye, Valuev, Chagaev & Chambers to beat 2 or 3 out of the 4.