I agree that in the 1st half, that 1) the OL and entire offense blocked well, 2) play calling did keep OU a little on their heels.
Barnes got his 3rd carry, a 19 yd run. After that, until Barnes 4th carry in the 4th Qtr, this is who ran the ball -
Delton 21 runs, Silmon 4, Dimel 3, Warmack 1, Zuber 1
Delton had 11 carries for 23 yds in the 2nd half (I'm not counting the 19 yard loss that he got on final play). None of those carries was a QB sack.
I could tell after the 2nd play in the 2nd half that we weren't going to run at will in the 2nd half. Our D had no answer for OUs offense in the 2nd half. However us getting 1 First down in first 3 drives of 2nd half was critical.
Ou gave us a big break with the botched snap. Prior to that Ou had run 35 plays to just 11 for Ksu after the break