I think it's more that smaller heavyweights have to stop being lazy. Sure they will be a big size disadvantage against the klitschko's, but I think it's more of a case that the Klitschko's are special talents then anything. I mean look how many guys have beaten Valuev who are around six feet tall. What's special about the brothers is that they are smart, very athletic, economic and they get the most out of their natural advantages.