I'm guessing you've seen none of these bigger fighters Rocky faced, in which case your opinion is worthless. Harrison just isnt a fighter and gets ko'd here none the less. Vitali/Wlad no how to fight and can utilise their size, whats more there maybe a case they are P4P as good as Marciano
Picking Klitschkoto beat Rocly is not the same as picking Audley to beat Rocky. Rocky KO Audley very early.
It was because of size AND skill, not simply size or Shaquille O'Neal would be champ. I hope I made the apparent. And don't start down the road that Vitali is not skilled. The skillset of a giant heavy is inherently different than a 6-2, 220 guy. My instructor always told me to fight big when I was taller and fight small when I was the smaller guy. You play to your advantages and have your opponent fight on your terms. Vitali is always the bigger fighter and uses his attributes to full advantage, always keeping the fight where and how he wants it. Well, almost always.