It's all about timing. The Sylvia vs Coutour fight was already set in motion before Mirko signed. No fighter, no matter how good you are, no matter your reputation will come into an organization and get an automatic title shot. After UFC 68, we will know who the HW champ is and after the Ganzaga/Mirko fight we will know who the #1 contender is. If Gonzaga beats Mirko, that's a HUGE if, he will get a title shot. The majority of the HW in the UFC are "bums" compared to Mirko but that doesn't mean Mirko should automatically get a shot, that's what the rankings are for. Same goes for Rampage in the LHW division, he'll get a title shot as soon as he becomes the #1 contender.
In short everyone in the HW division is a "bum" compared to Mirko CroCop, except Randy because he is a hall of famer.