#1 Seth Rollins

There may be no other Superstar on the roster that the company would trust in a spot like this than Seth Rollins. A former United States Champion and now leader of "his disciples" the Monday Night Messiah makes a lot of sense to win this championship.
The title would add so much to his character and promos and gives even more belief on why people do and should follow him. He's a magnet for succes, a magnet for gold and not to mention a magnet for attention. Imagine the matches that you could feasibly have just from his current feuds if he won the title.
Cody Rhodes' uncle is a WWE Hall of Famer. More details HERE.
You could see him against Kevin Owens, Samoa Joe, or Aleister Black or a combination of the three. I believe this would not only be the safest option as but would also bring some main event quality intrigue to the title.
The championship on Rollins would also guarentee a high level spot for the title at WrestleMania which you may not have with anyone else on this list.