Cody doesn't need to be the one in Cena's retirement match. Besides, the big face vs big face thing was done with Cena & Rock, and Cody hasnt even been back in WWE THAT long to be at that level. The last opponent has to be Orton. Can't think of any current guys except Austin Theory, but he hasnt had a huge, earned push yet.
it’s not the official “heel” theme. He said in the interview that the song is called “Fear My Name” and has saxophones in the music. And he said if it ever sees the light of day, he would like to replace the saxophones with trumpets. And he also said the song sounds similar to “My Time Is Now.” And for the vocals on this song, John Cena has always made music. This is probably a throwaway song that was scrapped from one of his personal albums.