I think the weight class or weight classes they pick for TUF are usually a good indication of what weight class needs a new star or two. When Amir Sadollah won there didn't seem to be much at middleweight, just a year or so ago they needed light weights, now they could use an up and coming star at heavy weight. I don't know how many legit contenders are needed at a weight class for it to be strong. Obviously you have your champ and a top contender. If you have 2 or 3 other guys that could beat the champ that's fairly strong. Now at Heavy weight you have Lesnar, Mir, Velazquez, Carwin, Nogueira, Couture, Gonzaga, Kongo, and Cro Cop. That's pretty good. Obviously after Lesnar and Mir you go down a tier, then Velazquez, Carwin, Nogueira, Couture, then down a tier to Gonzaga, Kongo, and Cro Cop. These rankings are interesting. I guess they don't really support my arguement but I found them interesting. I think UFC fans are definitely spoiled by the light heavyweight class more than anything. There are more current rankings out there but I like this tier system. http://www.mmaranks.com/