Wuk Lamat is not evil, not traitor and will not have the throne. Whatever big bad will turn out to be, it will disrupt the tournament and force the opposing competitors to work together. By the end they won't even be sure who won, but will decide collectively on a leader that is neither Wuk Lamat (she doesn't even want the throne, just competing to make sure warmonger doesn't get it) nor warmonger (nobody wants him in throne)