Rallis joined the WWE in 2014 and made his debut on the December 18th edition of NXT, that same year. He wrestled his debut match under the ring name Digg Rawlis, teaming with Cal Bishop in a tag match won by The Shoot Nation (Angelo Dawkins & Sawyer Fulton). Rallis would spend his developing years in tag matches and singles matches, often serving as an enhancement element to his opponents.
During August 2015, after wrestling under his previous ring name of Mike Rawlis, he debuted under his new ring name of Riddick Moss. As Riddick Moss he lost his debut match under this name, to Tye Dillinger. In January 2016, Moss formed a tag team with Tino Sabbatelli. They won their first tag match on January 15 of that year, defeating Rich Swann & Tucker Knight. Moss wrestled his first title match on the March 25, 2016 edition of NXT, challenging Finn Balor for the NXT Championship but was unsuccessful in winning the title. On April 15 at NXT, Moss and Tino Sabbatelli challenged for the NXT Tag Team Championships held by team American Alpha (Chad Gable & Jason Jordan) but were defeated. During the August 13 edition of NXT, Moss teamed with Billie Kay in a mixed tag match won by Daria Berenato & Shinsuke Nakamura. On September 15, Moss and Tino Sabbatelli participated in the Dusty Rhodes Tag Team Classic tournament, where they were eliminated in the first round by TM-61 (Nick Miller & Shane Thorne). During December 2016, Moss & Tino Sabbatelli challenged for the NXT Tag Team titles held by DIY (Johnny Gargano & Tommaso Ciampa) but lost three including the first match and in the two rematches.
During the course of December 2016 and into the following year in 2017, Moss remained mostly in tag team matches with Sabbatelli against a variety of teams including Heavy Machinery, TM-61, The Revival, DIY and The Authors Of Pain among other more randomized pairings of singles wrestlers. Moss & Tino Sabbatelli again challenged for the NXT Tag Team titles on June 8, 2017, but were defeated by the defending champions The Authors Of Pain (Akam & Rezar) and again during their rematch on June 10. During June and July, Moss and Sabbatelli would face off against new tag teams including SAnitY, and Street Profits, enduring losses to both teams. Moss wrestled his second mix tag team match on July 29, when he and Sabbatelli joined Sage Beckett in a match won by Asuka and the Street Profits (Angelo Dawkins & Montez Ford).
During September 2017, Moss and Sabbatelli resumed their pursuit for NXT Tag Team gold, entering a title feud with defending champions and members of SAnitY, Alexander Wolfe & Eric Young. Beginning on September 7, Moss and Sabatelli were unsuccessful in winning the tag titles and endured consecutive defeats in their two rematches on September 8 and September 9. Throughout the remainder of September 2017, Moss and Sabatelli entered a feud with the Street Profits, beginning from September 21, where they were defeated in tag matches leading all through the latter weeks of September, where their final tag team match defeat occurred on September 29.
- Signature moves
- Tag teams and stables
- "Riddy Mo"