One elite RB. McGowen was thought to be, and has proven to be, average not great.
As others have also said, Jase wanted to be the only top RB in the 2020 class. After McClellon committed, Knighton communication diminished (reference unavailable, it may have been a podcast), and OU didn't hotly pursue other top RB who showed interest (Milton, Tyree, Robinson).
The fact that Jase went to Bama when they had another top RB committed makes people think that he concocted a Manchurian candidate-like plot to stiff OU late in the cycle. Probably just changed his mind.
RB coach is a recruiting job. At this point, Murray's got to produce this cycle. He needs to pull at least three top RB this year + another:
Two top 100 RBs (Raleek included) + one more RB.
At least one of the seven 4-stars from his high school Bishop Gorman, NV (one is at RB). It would be great for OU to get the OT + either the safety or DE.
So yeah, 4 top players this year to compensate for having an under performing position group in 2020 and failing to bring in a single HS RB.