4. AJ Styles
Now THIS would be a shock to us all. The biggest free agent in wrestling, The Phenomenal One could shock the world by showing up at the Rumble. The only question that needs to be answered is - does the WWE want him? Unfortunately I'm thinking no, but by far the youngest guy on this list, Styles could come in and be an instant difference maker. AJ isn't the most recognizable face in wrestling outside of the WWE inner circle, so maybe the WWE doesn't think anyone would know who Styles was. That's a shame. AJ is one of the most athletic wrestlers in the business today. It's unfortunate that not very many people know it. Who knows what the future holds for Styles, Rumble or not, it'd be fun to see him in a WWE ring.