#4 Worst Choice - Ricochet
Of the stars that are relatively new to the main roster like Ali, Murphy, Ricochet, Aleister Black, Cedric Alexander and Andrade, only the One and Only has captured a main-roster title. While his reign was only about a month, just like any Charlotte Flair reign, it counts towards the number of titles won by a Superstar. McIntyre did win the RAW Tag Team Championship, but it wasn't a singles title.
He's already one of the most over stars regardless of main-roster tenure and has already had a mini-push. His feud with AJ Styles and his coming out to help Seth Rollins after the main event of RAW this week already means he'll likely be hovering around the upper mid-card and main event scene.
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King of the Ring needs to push a newer star forward, because they totally ruined the chance of doing so this year at Money in the Bank. Had they had another star win the briefcase instead of the Beast, then they might not be in this position of "needing to create a new star." Ricochet would certainly be deserving of a win but he's already been pushed. Several other stars have not, so I think it's someone else's turn.