That’s up for debate. In the first couple of games, they made sure to get Wilmore a series in the first half to spell Moss. In the OOC games, Wilmore didn’t do anything to distinguish himself and it is telling that Brumfield got the bulk of the reps when Moss went down against SC, and then for the rest of the season.
In 2020, they gave the same treatment to 22 and he made the most of the opportunity. And in 2021, there was always a 2nd back that got early reps so while it appears to be a plan, it is definitely fluid in who the RB2 is from week to week.
Carries by Game 2019:
Wilmore – 4, 6, 7.,, USC (1)
Brumfield – 0, 3, 3.,, USC (10)