#3 Ric Flair
The last time we saw The Nature Boy was when he was beaten up by the returning Batista on an episode of Raw. Flair never got to address the crowd and was shown in an unconscious state backstage.
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As of now, Flair has not appeared at all since the attack. Will we see him make an appearance at Mania, and interfere in the match between Triple H and Batista? This possibility can't be overlooked, as the dirtiest player in the game never goes down without a fight.
He might not be in any condition to retaliate at this point, but The Nature Boy could end up playing a significant role in the No Holds Barred match at WrestleMania 35, helping The Game to dispose of Batista once and for all.
Or, the impossible could happen, and Flair would turn on Triple H to reveal that the entire "attack" was a charade to coax The Game into accepting Batista's challenge.