#1 Cesaro

Cesaro is one among the talented professional wrestlers on the WWE roster right now and has the potential to become one of the greatest WWE Champions in the history of the company. Nevertheless, the WWE has not recognized the potential in Cesaro and hasn't made a single effort to push him as a world championship contender over the years.
Irrespective of being one of the best technical wrestlers that the company has to offer, the 'Swiss Superman' has never tasted world championship gold in the WWE yet. He is now working in the tag team division alongside Sheamus and will face Seth Rollins and Jason Jordan for the Raw Tag Team Championships at the Royal Rumble.
Apart from that, it doesn't look like that the WWE has any long-term plans for the 'King of Swing' and we can assume that the WWE will never put a world championship on Cesaro in the foreseeable future.
With all said, we should know that it's the WWE that we're talking about, the same company which made Jinder Mahal the WWE Champion. It may at some point in time put world championships on these 4 superstars. But as for now, I'll join all of you in hoping that this prediction does not come true.