The theme issue is two sided. On one hand, it's old. On the other hand, it's identifiable his. They're going to be hard pressed to find a theme that is decent, that is so identifiable with Cena. At best, they could have him record another "rap" and have the back beat mixed with some sort of military drums/marches, etc.
Like, obviously not this, but something like this with Cena rapping could work well.
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