But it doesn't matter if it costs him or not. There's a very limited range where you can copyright/trademark someone's real name on a universal basis; in cases like these where there is no use of their name on the show, there is no legal basis for WWE to be able to say that they "own" the real name or have any control what they do with it. I remember having this discussion with my trademarks law professor about this, and they found it interesting/amusing.
Throw in the whole "independent contractor" situation, and they legal basis to weaker than a jax promo.
Maybe if they were employees, or they restricted the scope to wrestling-related material, they might have an argument.
What gets me is that the only thing that's really letting them get away with this is the "take it or leave it" stand they are going to take, so no one is really going to fight them on it.