As seen during Monday night’s WWE RAW broadcast, Riddick Moss was called up to the main roster to serve as WWE 24/7 Champion Mojo Rawley’s enforcer.
According to Dave Meltzer, WWE can call you up to RAW or SmackDown at any time, especially if you are working for NXT but aren’t on TV. WWE currently has a rule in place that if you’re working on NXT TV, you can’t be brought up to RAW or SmackDown unless it’s “okayed by everyone, and it’s temporary, not permanent.”
With the Shayna Baszler situation, that was planned very far in advance. Moss had not been appearing on the brand’s weekly TV show and that’s the reason he was called up.
For what it’s worth, Riddick Moss used to yell out to NXT live event crowds that he loved “Vince Russo” in order to get generate heat.