ye but i dont personally think cotto hits that hard, his an accumulation puncher not a one punch ko artist, and when your boxing of the back foot as he was it was near impossible for him to stop margarito the way he would with most other fighters. wereas the likes of tito, hearns etc could hit stupidlly hard , and i dont care how good his chin is , the human body can only take a certain force to the head before it will shut down to protect itself