#30 Samoa Joe
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It is probably wishful thinking or blind hope, but I think the injury to Samoa Joe is a ruse and he makes his first appearance in the WWE since January 8th at the Royal Rumble Match with the final entrant.
If Joe is healthy, I think his main target is going to be John Cena. If I were booking the Rumble this way, I would have Joe come in and eliminate Cena within 30 seconds of entering the ring. This sets up a grudge match at the Elimination Chamber pay per view in February.
Say the injury is legit and Joe is out until late-March, then I'd give the #30 spot to Braun Strowman if he doesn't win the WWE Universal Championship in the triple threat match. If Strowman defies the rumors and wins, I'd love to see a pissed off Brock Lesnar in at #30 after that.
Continue on to see who I will be among the last four standing in the Royal Rumble Match, and will is going to win it all and go to WrestleMania...