#1 Kevin Owens

Of everyone on this list, no one convinces me more than Kevin Owens that he's a bonafide, legitimate star.
His promos are gold. He's unbelievable in the ring when he wants to be. And he's incredibly over with the WWE Universe for a guy who's practically been a heel in all his time in the main roster.
Cody Rhodes' uncle is a WWE Hall of Famer. More details HERE.
There's ample evidence that the powers-that-be think so too, given that he's spent more time on the main roster with a Title than without.
And should he be elevated to the main event scene on SmackDown Live (not that he wasn't already the main attraction, barring AJ Styles), I don't think anyone would really complain.
After all, it's not known as the Kevin Owens show for no reason.