The didn't set it up because they know Werdum is a horrible match up for Cain, a stylistic Nightmare & they didn't want to derail the steam Cain found when he won against Travis. Also they want to set him up for next title shot.
Sorry @One MMA Fan, But your boy has nothing for Vai Cavalo.
He is much fatter at this time and needs a full camp.He looked more than adjusted in his last fight