Well you may as well say the same for Edgar, Lesnar, & Faber.
Edgar has been given a title fight rematch, not a contender fight. Faber beat the next obvious contenders, he was number 1 contender, blame the division.
Lesner fought Mir twice which went 1 and 1, but he never looked out of place in the fight he lost. He got caught by a BJJ guy, the same way someone gets caught by a lucky punch. He also beat Randy Couture and Shane Carwin. The Carwin fight was epic and that was the fight that earned my respect.
You have to remember the time that these events happened, and all of the guys that you mentioned put up a fair argument to be given another title shot, in my opinion.