#2 King Corbin

Another Superstar whose on-screen character has grown in a big way after the WWE Draft, King Corbin could easily take the spot of Seth Rollins on RAW when he goes on a hiatus. He has performed this role in the past, and Corbin could return to that position once again.
One big reason why WWE could move Corbin from SmackDown to RAW is that there are not many storylines for him on the Blue Brand. He had a lengthy rivalry with Roman Reigns that saw him defeat The Big Dog twice and had some issues with Shorty G, previously known as Chad Gable.
Look who just shut down all of Tony Khan's critics! More HERE.
On the other side of that coin, there are many Superstars on RAW like Aleister Black, Drew McIntyre, Humberto Carrillo, Samoa Joe, Ricochet, and Kevin Owens with whom Corbin has never feuded with. He can lead a faction, and the crowd hates him.
Thus, Corbin deserves to return to RAW after the Showcase of Immortals to take his place of the top heel of the flagship show back. Since McIntyre and Corbin have some history between themselves, WWE could pull off a great rivalry in the post 'Mania season.