UFC is sanctionned by the Nevada state comission, i dont know about TUF fights, but i think it is as well. So no, Dana White did not influence the judges, if thats what ur impling. Bad decisions(if that was one,i dont know, i didnt see it) happens every events, thats why u should try to finish the fight.
As for the caracters things, its a lot harder to do, since the fighters are paid by 3 fights contracts usually, so they can disappear within a year. But there are already some, like having the americans almost dominating every weight classes. U can be sure Dana White is sending one of his own to Anderson Silva to hope to regain the belt.