#6 Dana Brooke
Dana Brooke has been with WWE for a long time at this point. She signed a contract with WWE in mid-2013 and spent around three years honing her craft on NXT. It's interesting to note that Brooke defeated Becky Lynch in her debut match on the main roster, with some help from Emma. Today, Becky Lynch is one of the most popular Superstars in all of WWE, courtesy her 2018-20 run as The Man.
Brooke, on the other hand, has spent the majority of her career as an enhancement talent. Her most memorable run in WWE was as a part of Titus Worldwide, alongside Titus O'Neil and Apollo Crews.
#5 T-BAR
Dominik Dijakovic made a name for himself on NXT but didn't win a title during his run there. He is currently affiliated with the unruly faction named RETRIBUTION on WWE RAW and goes by the moniker of T-BAR.
RETRIBUTION is currently a WWE RAW-exclusive stable
T-BAR can be usually seen on Twitter roasting fellow wrestlers, fans, and wrestlers from other companies. If WWE handles RETRIBUTION in a proper manner in the coming months, T-BAR could certainly be built up to the point that he gets a title run on the main roster.