Hasn't he retired about 3 times just in the last 2 years?
Granted, he has had legit medical issues, but I question his heart in MMA. I think the pace of pro wrastlin got to his head. I REALLY saw that in the Mir fight. He had a hold, then let go before he had the next hold. That was what lost him the fight. I do not think he realized the speed of REAL fighting after being away from it for so long.
Dude was a beast, though. No doubt. He just got some VERY bad habits in the WWF/E.