Oct. 26—Here’s a look at six key matchups for the Oklahoma-Iowa State game (11 a.m. Saturday on FS1) and how the Sooners fare in each area: Rushing offense: Oklahoma Through all of the season’s ups and downs, the Sooners’ rushing offense has been mostly steady and very productive. They rank 14th nationally in rushing offense (227.6 yards per game) and are averaging a healthy 5.1 yards per carry…