Have you ever boxed before? A guy can be 20 lbs lighter than you and still rock you if they land on the jaw. He had a low KO% because he just wasn't a very good boxer. There are tons of guys like Curtis Sheppard or Bert Cooper who were easy to outbox but hit hard as hell. Claiming Klitschko wasn't hurt at all by lewis uppercut is a huge exaggeration. Did he say that? Did he laugh or just shrug it off? Vitali was stumbling all over the place during that fight, it's just that Lewis was so old, fat, and gassed he had a hard time putting his punches together to take him out. Do you think the aggressive younger Lewis who blitzed Golota or Ruddock and took them out early would have failed to take out Vitali? Vitali was dropped by Sanders but it wasn't counted as a knockdown. He was also dropped by Troy Roberts, the fight is on YouTube. As I mentioned, it was a combination of Vitali facing weak competition which was mostly slow fat old sluggers and plodders like Peter, Briggs, Areola, etc who simply couldn't get past the annoying upright orthodox European stance that Emanuel Steward taught. I didn't say Ali had the greatest chin of all, but using the cooper fight isn't evidence against that. Anyone could have gotten dropped while off guard and being hit by a perfect left hook to the jaw they didn't see coming. Besides Ali took bombs from more big hitters than arguably anyone in history. He was completely washed up and a sitting duck for a prime Larry Holmes who couldn't drop him. Shavers couldn't knock him out either.