#1 Sheamus

The last-minute changes to WrestleMania 36 because of the Coronavirus pandemic seem to have had a very negative impact on Sheamus. Before Elimination Chamber, the rumor mills suggested that the Irishman would go after the Intercontinental Championship on the Road to WrestleMania.
Since he has had issues with Braun Strowman in the past and the Intercontinental Championship is the one title that has eluded him over the years, this could have been the perfect storyline for the former WWE, World Heavyweight, United States, and RAW/SmackDown Tag Team Champion. WWE Creative gave him a massive push as he squashed two upcoming babyface Superstars, Apollo Crews and Shorty G, in a handicap match quickly upon his return after a long absence.
Look who just shut down all of Tony Khan's critics! More HERE.
After WrestleMania, Sami Zayn is still Intercontinental Champion and Braun Strowman is Universal Champion. While the issue with Braun could be rekindled, chances are that the end game for Sheamus was not that title. With Zayn, a heel, still holding the IC Title, that drops Sheamus from the equation. Thus, Sheamus could show up on the RAW episode after WrestleMania 36 and announce that he has quit SmackDown because of a lack of opportunities.
He had earlier announced himself for the Elimination Chamber match, and WWE decided to cancel the match as if they had never announced it in the first place. Hence, this frustration could lead him to Monday nights, where he could replace Seth Rollins as the top guy and reign supreme on the Red Brand.