#3 Big Show
Big Show's career is winding down, and he doesn't have much gas left in the tank. The Giant is at the tail-end of his career and the injuries he sustained over the course of the last two decades are taking their toll on his body. 2019 was one of the rare years where Show didn't work a single wrestling match. With that said, it seems unlikely that Big Show will return to WWE programming as a full-time, active in-ring performer.
However, that doesn't rule out a one-off Rumble match appearance. The Rumble match is notorious for one-off appearances by legends. Jeff Jarret made a cameo appearance at last year's event, Rey Mysterio did the same two years ago at Royal Rumble 2018. Therefore, a one-off Big Show appearance at Royal Rumble 2020 makes perfect sense.
A WWE Hall of Famer isn't a John Cena fan. More details HERE
Moreover, Big Show is one of the most prolific and accomplished Rumble competitors. He has tossed over more than 30 men in the Rumble match and has made it to the final-four numerous times. The last time he entered the Rumble was in 2017, where he was quickly eliminated by Braun Strowman.
Before riding off to the sunset, The World's Largest Athlete should enter the Rumble match once again. It would be a nostalgic and euphoric occasion.