#2 John Cena
Let's be honest here.
John Cena versus Daniel Bryan would be a great match to do at WrestleMania 35, and Cena being put into the Chamber match would be the perfect way to go about it. All WWE has to do is have Bryan cost Cena the title with some kind of unbelievable heelish tactic, and then have Cena cut a promo on him the next night about Hustle, Loyalty and Respect.
Bryan can then counteract that with Eco-friendly talking points and discuss how Cena represents everything that is wrong with the company. If nothing else, that will create a very interesting dynamic between the two, allow the audience to get behind Cena, and maybe even set up one of the greatest WrestleMania matches of all time.
In the end, Cena versus Bryan would be a great direction for WWE to go with in the World Title picture, and could possibly result in a crowning moment for Bryan, depending on how WWE plays it. Of course there are various directions the company can go in and they all hold interesting possibilities, but this one is probably the most exciting.