#1 EC3

Ethan Carter III, one of the "fresh" callups from NXT, is yet to debut on the main roster. Fans are still wondering where the dashing superstar will land up, and it could very likely be on SmackDown Live.
Rusev announcing an open challenge for the championship, only to be interrupted by a debuting EC3, will send shockwaves into the WWE Universe. EC3 was one of the major superstars in TNA, and will undoubtedly be a force to reckon with in WWE.
EC3's run in NXT was quite short and did not feature any significant feuds, but his character will surely succeed on the main roster.
EC3's flamboyant persona clashing with Rusev's crushing gimmick will make for an interesting rivalry and get the fans talking.
EC3 claims to be in the Top 1 percent, but we all know Rusev is the best and Rusev is No.1!