WACO, Texas -- Art Briles has been saying it for nearly a year. After what his No. 4 Baylor team has endured this season, he definitely believes it too.

“We finally have Big 12-quality depth,” said Briles once more after the Bears’ 41-12 win over Oklahoma on Nov. 7.

In the two weeks since that game, he’s needed all that depth to come through in a big way. Briles is proud of the fact his 9-0 Bears don’t lean on any one person to succeed, and they’ve needed plenty of reserves to step up recently.

The Bears lost top deep threat Tevin Reese for the season to a dislocated wrist. Running backs Lache Seastrunk (groin) and Glasco Martin (knee) also went down against the Sooners and haven’t played since.

Third-string running back Shock Linwood starred against Texas Tech, rushing for 187 yards and a touchdown. Ronald Martinez/Getty Images

Like the rushing duo, linebacker Bryce Hager is questionable for this week’s huge test at No. 10 Oklahoma State with a groin injury. Left tackle Spencer Drango had back surgery on Tuesday and is out indefinitely.

It’s November. The guys that are practicing and playing are banged up, too. And Briles’ confidence in just how deep these Bears are is being put to the test.

“I wish we weren’t having to prove it,” Briles said. “You hate to see anybody give so much time and effort and soul to a situation and then not be able to carry on.”

And yet, Baylor keeps plugging in new parts and thriving.

Levi Norwood replaced Reese and scored three touchdowns against Texas Tech. Redshirt freshmen Shock Linwood and Devin Chafin filled in at running back and each went for 100-plus yards. Another freshman, Aiavion Edwards, took over for Hager.

“The only thing that’s changed is the name and the number,” senior safety Ahmad Dixon said. “Guys are still running the ball as if Lache was there. Guys are still catching the ball as if Tevin was there.”

And those are just the obvious spots, where injury created opportunity. How’s this for depth: Defensive end Shawn Oakman leads the team with 12 tackles for loss and isn’t even a starter. Fellow backup Jamal Palmer is second on the team in sacks.

True freshmen Byron Bonds and Andrew Billings are getting major minutes at defensive tackle and succeeding. The Bears’ No. 3 cornerback, Joe Williams, has 22 career starts.

Baylor has been stockpiling talent like this for years in preparation for a season like this.

“It is critical. It’s something our staff and everybody has done a great job recruiting to fill needs,” Briles said. “That’s the first thing you look at, what needs do we need to fill? We’ve been fortunate up to this point. I don’t think you ever get to where you want to get, but we do have guys that can play on our roster.”

The development of that Big 12-caliber depth begins with recruiting, but getting them to Waco was just the first step. Bears players say they wouldn’t be ready to play whenever needed if not for strength coach Kaz Kazadi.

“We rely on Coach Kaz a lot,” Chafin said. “Coach Kaz is our base and foundation. He has us ready physically.”

Kazadi has been part of the Briles regime from day one and is renowned for his intensity and passion. Players say his offseason regimen is especially challenging. And borderline crazy.

Dixon offers this example: Kazadi tinkers with the atmosphere of his workouts every day. He’ll crank the temperatures to hot one day and cold the next. Blast rap music one day, old-school reggae the next and the Baylor fight song the next, never at the same volume. He’s trying to create chaos by any means necessary.

“He puts us in difficult situations, weird situations,” Dixon said. “I mean, you sit there and you hear the fight song over and over, doing drills in the indoor during offseason. He’s doing everything possible to try to throw our focus off.”

There’s another key reason why so many Bears are ready to ball: All those blowouts.

Only three foes have faced Baylor’s starting offense in the fourth quarter. Bryce Petty has 11 pass attempts in the fourth. Seastrunk has two carries. The rest of the snaps have gone to backups and underclassmen, and those extra reps are proving valuable now.

Going into the Oklahoma game, Linwood and Chafin had a combined 86 carries. The third- and fourth-quarter snaps they shared early in the year brought needed experience.

“Us young people still have a lot to learn, but for us to step in at a big level like that just shows us how to prepare ourselves and all the depth we have,” Linwood said.

Dixon can spot that depth and development every day on the practice field. The amount of talent on the Bears’ roster has come a long way since he was a freshman. It’s going to take a lot more than the best 22 to sustain this Big 12 championship run.

“That depth, that offseason, all of that work with Coach Kaz has helped us,” Dixon said. “We’re starting to turn elite."