I think they should have to fight to get into the house but should space out showing the fights. I think in the beginning of the episode they should announce that episode's fight and then show those fighters qualifying fights or highlights (depending on how long and good the fight was). That way we get more fighting per episode (in the first round) and the strengths of the fighters will be fresh in the viewer's mind. And since I like more fighting per episode I would do 2 fights a episode after the first round.
Jon Jones, Demetrious Johnson, Renan Barao, Marius Zaromskis, Douglas Lima