Is their screening process weak or do they put a couple lesser fighters on the show to make the legit guys look better?
When you so up to try out you roll with the other people tring out. So you might not be that good but the person you roll with may be that much worse so on the end you look good. Then when you get on the show you don't look as good as the other guys. just a guess.
Then again try outs are not everyday twice a day like the work outs. Maybe the can look good for a day or so but can't handle or just don't want to work out that much or that hard..
I don't know, but I suspect that they try to get a mix of great fighters and personalities. Makes the show interesting, but it also creates stars.