#2 Adam Cole
So, Cole is another Superstar who has plenty of life left in his NXT career. Leading The Undisputed Era and holding every title but the main one, you wouldn't be shocked if the faction dominated the yellow brand for the next year and picked up the NXT Championship along the way - but Cole's appearance at the Royal Rumble was greeted to a huge ovation from the crowd, proving himself to be incredibly over with the WWE Universe.
Cole has been praised by several WWE legends and has even been likened to Shawn Michaels in recent times, and it would be no surprise to see WWE fast-track the North American Champion to the main roster when he eventually loses the title.
The big question is, "Does he come alone?" The Undisputed Era could undoubtedly dominate either brand if they came to Raw or SmackDown as a faction.