#1 Daniel Bryan

In 2016, at only 34 years of age, Daniel Bryan retired from professional wrestling due to medical issues arising from multiple concussions. In July of that year, he was named the General Manager of SmackDown following the return of WWE's brand extension.
Bryan has not wrestled for over two years now since April 16, 2016, the episode of SmackDown, in which he teamed up with United States Champion John Cena to defeat WWE Tag Team Champions Cesaro and Tyson Kidd by submission.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
However, Bryan has lately hinted at a potential return to the ring. His wife Brie Bella also recently revealed in an interview with Lillian Garcia Podcast that Bryan had visited doctors all over the US and they all gave him encouraging news. Bryan still needs to get clearance by the WWE medical team for him to compete. It is very clear that he misses wrestling and cannot wait to lace his boots one more time. What better place to make a return than at the Royal Rumble. An appearance at the Rumble would make the fans go crazy with chants of "YES! YES! YES!" almost blowing the roof off the arena.