#2 By interjecting himself into a championship rivalry

While the possibility of Sheamus competing with either Roman Reigns or King Corbin seems tempting, there’s another rivalry that could do well with Sheamus’ inclusion.
Braun Strowman and Shinsuke Nakamura seem to be heating up for what should be an eventful Intercontinental Championship rivalry. Nakamura has held the title for some time, but hasn’t had enough title defenses, while 'The Monster Among Men' is still looking for his first singles title reign.
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Since both top mid-card Superstars look set to have an interesting rivalry, WWE could pull off a swerve and have Sheamus ruin a match between the two. This could allow Sheamus to be a factor in the Intercontinental Championship picture immediately.
Alternatively, we could also see Sheamus attack the person who ultimately comes out on top in this rivalry and straight away begin a new championship feud. Whether that will be Shinsuke Nakamura or Braun Strowman, only time will tell.
Since the Universal Championship picture is a bit crowded at the moment, Sheamus could find his opening in the mid-card title scene and win the Intercontinental Championship in the process.