His skills deteriorated drastically at the end of his last run. All he wanted to do was end the fight quicks using his gifted speed and power at heavyweight. He has lost the discipline to train his skills and age also caught up to it. Since his last fight, his age has only increased, and his skills has not been practiced as much. What makes people think he won't get absolutely embarassed by any top 20 UFC heavyweight if he came back. Add on to that, his aura is gone. No fighter is scared of Fedor anymore, what he looks like is a huge stepping stone that will propel them into the number one contender spot. That's all he is.