I've watched that fight countless times and that knee Bigfoot mentioned barely touched Overeem. After the fight i thought Overeem got hit a lot but when you re-watch it you can see things more clearly.
Exactly. He blocked so many lazy punches that if he just looked to eat one to throw a left hook and set up a KO then he could have finished the fight. Werdum threw a lot of strikes and had Overeem backing up which made it look as if Werdum was connecting.