You people dont know anything about boxing do you?
First off, Tua has never been knocked out or knocked down.
Second, Chris Byrd already beat Tua by decision, but Byrd is not a champion, he has no belts. Lennox Lewis is the WBC, IBF champion. John Ruiz is the WBA champion, and Wladamir Klitchsko is the WBO champion.
Third, Clifford Etienne never even fought Chris Byrd and if he did then Byrd would easily outpoint him. Byrd has fought Wladamir Klitschsko however, and Klitschsko whupped him easily. Byrd is currently the IBF number one contender so he will probably be fighting Lennox Lewis soon if Lewis gets past Tyson.