#4 Sheamus
Sheamus has been out of action for a while due to his past injuries which have returned to haunt him. But, recent reports have indicated that he is well and raring to go once again.
Also Read: WWE News: Update on rumors of Sheamus possibly retiring due to injury
The Bar, the team of Sheamus and Cesaro, are no longer a tag team, following Cesaro's move to RAW. This would indicate that Sheamus will also follow Cesaro and have a singles run, possibly in the mid-card. I could see him competing for maybe the Intercontinental title, perhaps a feud with his fellow Irishman, Finn Balor, who currently holds the title on SmackDown.
Balor faces off against Shinsuke Nakamura for the Intercontinental title at Extreme Rules. Perhaps Sheamus could interfere and attack Balor to cost him the match, but not the title, and then feud with him.