#3 Sonya Deville - WWE SmackDown
Sonya Deville was a part of WWE SmackDown before she took some time off. The reason behind Sonya's indefinite leave of absence was attributed to an unfortunate attempted kidnapping incident.
Sonya's last bout was against Mandy Rose in a "Loser Leaves WWE" match at SummerSlam. Deville lost against her onscreen rival and real-life best friend, and hasn't been seen on TV since.
From an objective standpoint, Sonya Deville should return to SmackDown when the time is right. Even though stars like Alexa Bliss, Bayley, and Sasha Banks have been making waves on the blue brand in recent memory, SmackDown needs legitimate female contenders in the long run.
Sonya Deville's momentum on SmackDown was at an all-time high around SummerSlam, so it only makes sense that she should return to her rightful brand to claim her rightful spot near the top of the card. An efficient way to bring her back would be during the 2020 Draft.
Mandy Rose was recently traded to RAW, so it would further complicate matters for Sonya Deville if she were drafted to RAW as well. In kayfabe, striking a unique deal with FOX officials, or Adam Pearce, could be the backstory for Sonya's return.