#4 Sarah Logan
Sarah Logan has probably been the least favorably booked member of the former Riott Squad. She primarily appeared on Main Event last year and when she has appeared on RAW recently, it has been in losing efforts. Charlotte Flair easily dispatched of her and then Rhea Ripley did the same after Logan confronted her.
From viewing all of her prior matches, it's easy to see that Logan is very talented in the ring. She's physical, a good striker and deceptively strong. That hasn't been tapped into for her but could be something used as an impetus for joining the Monday Night Messiah.
The former Riott Squad member is probably at her lowest as a character after some disappointing defeats to Ripley and Flair. They weren't competitive matches but instead squashes. Rollins could easily speak enticing platitudes into her ear and say that with his help, she could be so much greater.
Once again, it would be similar to how Murphy felt at his lowest after losing all of his matches to Aleister Black. It would need to intertwine into a feud with some women on RAW but the Straight Edge Society did have Serena Deeb. Aces & Eights had Brooke Tessmacher. Logan deserves a spot every week on RAW instead of randomly showing up to lose a match. She's also going to be in the Elimination Chamber match so she needs some backstory and a reason for fans to believe that she's a threat.