#4 Akam and/or Rezar

Without giving away spoilers for TakeOver: Philadelphia, let’s just say it wouldn’t be a surprise to see Akam and Rezar on Raw or SmackDown Live in the not-too-distant future.
The no-nonsense Authors of Pain, with Paul Ellering as their manager, held the NXT Tag Team titles for 203 days before losing them to SAnitY at TakeOver: Brooklyn III in August 2017.
If we’ve learned anything from NXT title changes over the years, it’s that losing a title – or, in this case, titles – is generally a sign that a Superstar’s time in NXT is up and that they’re destined to join the main roster.
In all likelihood, AOP will probably debut in WWE by attacking a tag team on an episode of Raw or SmackDown Live. However, like with Lars Sullivan, it’d be wrong to rule out a Rumble appearance, even if the call-up is initially only a one-off.