#5 Sami Zayn
The underdog from the underground. Much like Daniel Bryan, Sami Zayn is the guy everyone loves to get behind and it's been that way since day one. You could argue that he's had more expectations on his shoulders than the leader of the Yes Movement did, but either way, the smartest thing WWE could do would be to replicate DB's rise to the top of the company.
Zayn has already sort of begun that climb with the feud against Braun Strowman, but sooner or later, it will be kicked into the next gear. Sami becoming Champion would be a glorious story and whilst many people think it may never come to fruition, WWE is usually able to tell when they've got a golden storyline on their hands.
Barring injury, Zayn could win the title at WrestleMania before defending it against a number of Stephanie's minions. He could hold onto the belt until SummerSlam at least, and from that point onwards Zayn would be a bonafide main eventer. This really does write itself, and all Vince needs to do is put it out there for the world to see and appreciate.
From good to oh so evil.