This. No matter how good some MW is P4P, he will never be a match for a HW. HW undisputed champ is the best boxer in the world, just like Usain Bolt is the fastest man on earth, even if some midget runs faster foot for foot.
His last 4 fights at cruiser were against decent opposition, and all eneded in KO, as have his fights with Ruiz, Barrett, and he rocked Valuev with pretty much the only good shot of the fight? Don't be silly. Steward said that Wlad's shots against might have looked powerful, but because he could never properly set himself due to Haye's defensiveness none of the punches were really that strong.
All I know is that several guys who have gone into the deep rounds with Wladimir have never been the same afterwards. I think Wlad hits damn hard, but doesn't follow through so his punches have more snap like a whip, than driving force like a sledgehammer. But he hits his opponents with so many of those whip shots that it's like being in a mini car crash over and over again. Wlad's damage is worse in the long term than many of the KO artists we know and love. I think it's better/healthier for the brain to just get KTFO early, than to be beaten up systematically the way Wladimir does it.