I don't think Manny does hit that hard. It's the volume and speed that overwhelms people and they can't keep up. I think the Hatton KO was so bad because Hatton's chin has been on the wane since Tyszu. Collazo nearly had him, Urango rocked him to the body, Mayweather did a double KO and even Lazcano had him wobbly. Stick him in with Manny who has pop and punches from angles you aren't expecting and out you go. Cotto has holes in his chin and has been regularly checked on his way up, but it was the ref who stopped it, Cotto would have got through the round. DLH wasn't knocked down and simply quit and Clottey made it through by not punching back. Manny has power, but I don't think he has the same one punch power of a fighter like Mosley.