2: Seth Rollins
Seth Rollins has been in red-hot form since late last year with rumours even suggesting that John Cena himself advocated for Rollins to win the Gauntlet match on RAW to face Lesnar at Mania. That didn't happen and Roman faced Lesnar at Mania and lost. Then Roman lost again at the Greatest Royal Rumble.
Rollins, on the other hand, won the IC title at Mania and has defended his title on 3 continents since then. Rollins also came out on RAW last Monday saying that he doesn't want to be a champion like Brock who never shows up.
The story between these two writes itself if WWE decide to go in that direction.
Edited by anirudh.b