I think the format works well, for the case where there are more than 3 people who can win HoHs. Survivor had an all winner season and it was incredibly unpredictable and entertaining. This season of BB they just happened to pick three people who were just smarter and more physically strong than all the other players, who had similar games and personalities. Cody, Memphis and Tyler.
Although, at this point I'm rooting for Enzo. I really like his game. He was never a member of the Committee, yet he was never targeted by them. He doesn't win stuff, yet he's best friends with all the people who do. I'm super impressed by his social game. If Cody, Memphis and Tyler pick each other apart and Enzo slides in with the victor and gets the money, I'll be happy.
Cody, Enzo and Memphis have all never been nominated, and we're down to 6, and probably will stand down to 5. That is extremely unusual. I wouldn't be too sad if any of them win, but I hope Enzo wins. Best social game of all time.