#3 Bray Wyatt
Many fans would have forgotten that Bray Wyatt is still a part of WWE and RAW. Wyatt had a terrible 2018 despite holding the RAW Tag Team titles with Matt Hardy. He's had a few terrible feuds lately, and has been off television since Hardy stepped away from the ring to recuperate from his injuries.
The 2019 Royal Rumble could be a great way for WWE to re-introduce Wyatt, maybe with a refreshed gimmick that will bring him back in the reckoning at the top of the card.
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Wyatt's gimmick of being a mysterious, creepy wrestler is one that is seldom seen on WWE television. WWE need to refresh his character and unleash a new demon, maybe even reform The Wyatt Family, helping Strowman win the Universal title from Brock Lesnar.
Wyatt's entry in the Royal Rumble could be a surprise one and a win for him will certainly help him get back to the top.