#7 Drew McIntyre
If reports are to be believed, Drew McIntyre should be returning from injury sometime around WrestleMania. It wouldn't surprise me if he's immediately called up to the main roster. The NXT landscape doesn't have much room for him at the moment.
McIntyre's last main roster run was disappointing, but he's a different man today. Fans won't forget his 3MB status, but he is the most talented of the three. He looks like a star, can put on star matches, and cut good promos. He could easily be one of the top five guys on either Raw or SmackDown. He wouldn't look at all out of place standing in the ring with Roman Reigns, John Cena, AJ Styles, Shinsuke Nakamura, Braun Strowman, or Brock Lesnar.
We still don't know if that's how he'll be booked, though.
Chance of success: good