I'm with ya'll that it does suck he is done fighting now but glad he will still be involved with the UFC and congrats on the new position! I really wanted to see him fight one last fight against Serra again and go out with a win. I know he would most likely win but anything can happen in a fight and it when it really comes down to it, he wouldn't have much to gain from the fight other than finishing Serra which I think he would have done have it not been for that headbutt. So, I would much rather him go out on a loss to another future hall of famer in BJ Penn.
Thanks for all the great fights and what you have done for the sport!