I agree, it should have been a no contest had Barrera decided to quit. However, Barrera did not quit because he wanted to take the risk. Probably thinking that he could TKO khan. Khan did not give him the chance to do that so I give credits to Khan.

Had Barrera incidentally TKoed Khan with a lucky shot, the story would have been different. People would praise him for it and he will be back in the game again. Unfortunately for him, the tide did not go with him. Barrera took the risk and must suffer for it. Credit should be given to Khan.