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College football Week 6 takeaways: Oklahoma's free fall, Tennessee's test, Heisman rankings

William Purnell/Icon Sportswire

Week 6 of the college football season was ... odd. Quarterback injuries made for strange viewing experiences.

Alabama was able to fend off an upset bid from Texas A&M without defending Heisman winner Bryce Young. Kentucky wasn't so lucky, falling to South Carolina without Will Levis. Kansas nearly kept up with TCU thanks to a brilliant performance from backup Jason Bean, in for Jalon Daniels. Oklahoma got its Red River Showdown doors blown off without Dillon Gabriel. Arizona State upset Washington with former walk-on Trenton Bourguet at the helm and Texas Tech threw a serious scare into Oklahoma State with a third-string quarterback. Louisville backup Brock Domann potentially saved coach Scott Satterfield's job with a solid performance in a win over Virginia. Et cetera.

For quite a few important teams, this was a survive-and-advance week, one in which we lost only one unbeaten team -- oh, what could have been, Kansas -- and gave us as much oddity as useful information. But storylines still emerged; they always do. Here are six particularly interesting takeaways from the second Saturday in October.

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Heisman of the week | Favorite games


What on earth has happened to Oklahoma?

Texas 49, Oklahoma 0

It's difficult to underachieve against the spread for a particular period of time because the books adjust. If a team is worse than expected, the bar will keep being lowered until equilibrium is found.

Sometimes, however, a collapse comes so swiftly that it takes a while to find equilibrium. Sometimes you pull a John Mackovic. Or a Turner Gill.

Which brings us to Oklahoma.