I thought the vomit eating was UT's S&C coach, but whatever, I'll assume good will and play along.
The 2017 and 2018 OL groups were among the best OU OL since the 1980s. The OU OL in 2019 was expected to regress because of personnel losses and lack of experience. They did regress but OU's run game was still efficient because they had an efficient run threat at QB, Hurts, who hit the holes and made pretty good reads.
Did you watch the OL last year trying to pull? The same guys that were relatively efficient at doing it in 2019 were late and whiffing at blocks two years later. Add to that Williams, while incredibly explosive, missed holes and reads.
When Schimdt left in 2017, I was glad. While his results were impressive, his manner seemed deeming. I was hopeful that Wiley would achieve similar results with a better demeanor. The OL looked worse every year, the DL would get pushed back 2 yds, and OU's WR weren't breaking away from DBs.
We'll learn whether how much credit to give Schimdt for OU's OL perform over the next couple of years because most of the other coaches are the same. It's an interesting experiment.