#4 NXT star Gunther
WWE fans may not be overly receptive to WALTER's name being changed to Gunther. But a big showing in the Royal Rumble Match would ease those concerns. The Austrian should also represent NXT in the 30-man contest and showcase his in-ring excellence.
Gunther can spend some time in the Rumble and possibly eliminate a few entrants, although he will probably be serenaded by 'WALTER' chants. As long as his booking isn't radically overhauled, The Ring General should be fine.
#3 Shane McMahon
Reports have indicated that Shane McMahon will be returning to the Royal Rumble Match. Furthermore, a fan currently in St. Louis tweeted this picture with the former SmackDown commissioner, which may be another indication of his return.
If Shane O'Mac really shows up, it might be to set up a match at WrestleMania 38. He can slot into Vince McMahon's storyline on RAW with Austin Theory and put the 24-year-old over at The Show of Shows.