#1 Big E
On last week's edition of SmackDown Live, Big E made his return from injury. However, the return was short-lived, as he was attacked backstage by Kevin Owens.
As of this writing, Big E isn't cleared for an in-ring return, which is why he was taken out by Owens during last week's show. We don't know how much longer he'll be out of action, but if he's able to return sometime soon, it's quite possible that a heel turn could be in the works.
The New Day has been together for over four years at this point, so it could be time to finally split the trio up. So, whenever he is cleared to return from injury, we could see Big E turn against his longtime buddy Kofi Kingston, and be granted the next shot at the WWE Championship.
WWE was reportedly really high on Big E when they brought him up to the main roster, so they might go all the way with him, which would mean a WWE Championship win if they turn him heel.