The Wrestlemania match should be a Triple Threat between these 3. A simple rematch would make it too predictable (like Cena vs Rock II was). With LA Knight added to the mix it will not only make it unpredictable as to who will WWE give the rub to, but it can also introduce the factor of people thinking LA Knight or Cody could eachother the match. The win should obviously go to either getting the pin on Roman and their feud continuing from that point forward.