#1. Aleister Black
This is another addition we fully expect and one that was teased in the Royal Rumble 2020 as well. After getting eliminated, Aleister Black had a ringside brawl with Buddy Murphy and AoP, indicating that he'll be resuming his feud against Murphy in a different form.
The trilogy between Black and Murphy was a brilliant one that benefited both men. Even though Black beat Murphy 3-0, the Australian looked great in defeat and it would serve as a catalyst for him to join Rollins.
Aleister Black is the second of the two most logical and sensible additions to this rivalry. Given his recent history with Murphy, who better to put in that spot? It would be a big push for Black as well and he would likely be protected in defeat.
Just like Murphy, he's long overdue for a regular spot on television and what better way to do that than to put him up with some of RAW's top stars? He'll end up benefiting more from one storyline than he did in his entire SmackDown run last year.