TUCSON, Ariz. -- Doughnuts, inner tubes, Swiss cheese, the ozone layer, prairie dog communities and the Colorado defense.
These are things universally understood to have holes in them.
The holes Arizona running back Ka'Deem Carey ran through Saturday in a 56-31 win against the Buffs were gigantic at times and allowed Carey to set a new single-game Pac-12 Conference rushing record with 25 carries for 366 yards and five touchdowns.
Carey joined a growing list of opponents to have career days against CU defenders this season as the Buffs continue to struggle mightily in coordinator Greg Brown's system. With the Buffs failing to show improvement and ranked at or near the bottom nationally in numerous defensive statistical
"Those decisions, that stuff's for the head coach and the AD," Brown said when asked if he was concerned about his future at CU. "That's not for me to address."
Coach Jon Embree said he will evaluate all his coaches and himself at the end of the season but he has no plans to make changes before then.
"We're going to play this out," Embree said. "That's not fair to anybody to talk about that stuff. ... I just don't think that's the right thing to do."
Embree said he does not believe effort is an issue with his players.
Brown said he prepared his players all week in practices and film sessions for a heavy dose of Carey, but the Buffs still managed to make the 5-foot-10 product of Canyon del Oro High School here look like Earl Campbell.
Carey averaged 10 yards per attempt in the first half on his way to 121 yards and three touchdowns. At halftime, the Buffs were still in the game thanks to CU's offense being matched against one of the few defenses in the nation as bad as the Buffs.
But the Arizona offense throttled up and made CU look silly at times in the second half. Carey ran 13 times for 245 yards and two more scores after intermission.
"When you play a phenomenal back like Ka'Deem Carey and you don't tackle and you don't wrap up on your tackles and you don't take care of your gap assignments, things like that are going to happen," Brown said. "Those two things were big. We did not tackle well. I knew that the guy would be a very tough runner. He kicks out of a lot of tackles."
CU junior linebacker Derrick Webb said the problem once again was the read-option element of the Arizona offense. It has given the Buffs problems all year. Not that they haven't also struggled against more conventional styles.
Webb was asked why CU hasn't been able to show improvement defensively, especially against the read-option and cutback runs. Once again there were too many missed assignments and poor gap responsibility.
"That's the thing about zone-read offenses. It's all about assignments," Webb said. "You have to be sound. Ten guys can be playing their butts off and doing their jobs and all it takes is one gap. He was able to find that gap and he hit it hard and off to the races."
Follow Kyle on Twitter: @KyleRingo