#1 John Cena
While people are speculating about John Cena status for WrestleMania, the WWE has not really given out any hints about his return or the opponents he might face. However, it would be naive to believe that John Cena would be left out of WrestleMania.
John Cena might not be as active as he used to be on the roster but that does not diminish his credibility by any means. John Cena is just too big of a star to not have any presence at the Grandest Stage of Them All. While he might not be actively involved in any match, the WWE would definitely pull out all stops to keep him in any capacity.
Given Cena's star power, he can always light up a crowd and in this situation, the WWE definitely needs to keep the light of excitement burning. It is quite possible that John Cena would make appearances before the event itself in the coming weeks, but it would be best to keep him waiting for the ultimate event.