The OL pass blocking is generally good, despite a high sack rate. There have been some issues this year with blitz pick up. The blitz issue is attributable to OU rolling out a RS-Fr center and RB blitz pick up issues. The Sooner QBs also have had a tendency to hold the ball forever and leave clean pockets, frustratingly.
Run blocking has regressed, partly due to development and partly due to scheme. A lot of the really good offensive linemen OU's had weren't highly rated recruits but program guys that Bedenbaugh developed. That development basically stopped from the 2018 class on. From that class on, OU's gotten contributions from 2 out of 15 (!) OL recruits. Included in that are 4 top 100 recruits (1 5-star, 9 total 4-stars). So talent acquisition isn't the problem, but several of these presumably highly talented players have gotten ZERO run yet are still in the program. I was hoping that some of the seniors would opt out of the bowl game so we could see what we've got in some of the younger OL in live action.
The GT counter is the Sooners bread and butter play, the play that sets up so much their neat misdirection. The strength of the Sooners from mid 2015 - 2018 was OU could tell you that that play was coming and still get 6 yds off it most of the time. Defenses caught up, the pullers aren't as nimble, and Riley's been slow to vary the play design. OU's success running the ball this year has been with zone blocking schemes. OU hasn't had a back with great wiggle/run-after-contact + long speed since 2017 also so some of those 80 yd runs have now become 30 yd runs.