#3 Isaiah "Swerve" Scott
One way to give the Robert Stone Brand some legitimacy is to have an established NXT Superstar join his ranks. It might be heading that way with another entry on this article but Isaiah "Swerve" Scott just screams star. He could be the crown piece of the brand and one that finally garners it some respect.
Swerve is too talented to be a star of the NXT Cruiserweight division. We saw him branch out into random competition when he faced Johnny Gargano on a recent episode of NXT.
Hopefully that's a sign that he won't be constrained to being only a Cruiserweight competitor. He could still occasionally compete in that division but he could also chase the NXT North American or NXT Championships.
Once the Undisputed Era - and mainly Adam Cole - moves up to either RAW or SmackDown, other stars will need to fill the void. If you've seen Scott's work in other promotions like Lucha Underground, Evolve or Major League Wrestling, you know that he can carry a brand and be it's top Superstar. Like most Superstars in WWE or NXT, he just needs a direction and a push.
He's currently a face as he aided Mia Yim when she was being attacked by Candice LeRae. It wouldn't be hard to execute a heel turn for him. Just have him operate as an arrogant or over-confident Swerve rather than just being a confident wrestler. There is also potential to maintain some comedic segments between Stone and Swerve because the latter is good on the mic.