#4 Sheamus, Shinsuke Nakamura, and Cesaro
Prior to Sami Zayn's hiatus from WWE, he was part of a three-man faction with Shinsuke Nakamura and Cesaro, known as The Artist Collective. While the faction didn't garner the amount of success it would've hoped for, the trio did lead to Zayn winning the WWE Intercontinental Championship this year.
Of course, Zayn would eventually be forced to vacate the title and with the former IC Champion taking some time off from WWE TV, the duo of Cesaro and Nakamura are left without a third man.
A former WWE writer just went after JBL for his comments HERE
While Nakamura and Cesaro don't necessarily need a third member, I'm sure the fans wouldn't mind seeing Sheamus align himself in a group which already consists of 'The Swiss Superman' and open-up on the possibility of a potential Bar reunion.
As a tag team, Sheamus and Cesaro were highly-successful and if reunited, the duo could add some much-needed depth into the SmackDown Tag Team Division, while Nakamura could focus on a singles run and still continue to represent the faction.