#4 John Cena vs Daniel Bryan

The WWE Title has not had the best run as of late, from being second to a title that is hardly on WWE programming to being contested in repetitive matches, its safe to that WWE didn't really care for the WWE Title last year, but that could all change, as WWE is starting to build up fresh competition for the title this year.
Challengers form Mustafa Ali to AJ Styles have all being involved in Daniel Bryans affairs over the last few weeks, and its safe to say that is a direction WWE might not go in, as Styles is embroiled in his own narrative, and Ali getting a push this early in his push seems unlikely.
Cody Rhodes' uncle is a WWE Hall of Famer. More details HERE.
While fans still want Ali or Styles to dethrone Brayn, it seems WWE could go for the safe option, and that is John Cena. Cena's return to WWE TV is purely to bring the product up again in terms of ratings, viewership and tickets sales, as WWE has been tanking hard without a megastar at its forefront.
Moreover, Cena is arguably one of the most popular movie stars in the world today as his roles in movies like Bumblebee have really shone the limelight more on the 16-time World Champion. So Cena winning the Royal Rumble match and going on to face Daniel Bryan could be a possibility WWE has considered, as they did a top draw for Wrestlemania, and Cena in the main event is a surefire way to guarantee that.