Mike Vrabel enters only his third season in coaching following a 14-year NFL playing career, but the Ohio State assistant might never again face a challenge like the one that sits before him.
It's rare when a defensive line coach steps on the practice field and doesn't see a single starter from the previous season. How rare? According to Ohio State's athletics communications staff, the Buckeyes haven't had a complete overhaul of their starting defensive line since the 1985 season, when all three top spots had to be filled. Although Ohio State ended up starting four new linemen in 1998, it had a returning starter from 1997 (end Matt LaVrar) on the roster.
All four starters from the 2012 team -- ends John Simon and Nathan Williams, and tackles Johnathan Hankins and Garrett Goebel -- have moved on. The effort to replace them is arguably Ohio State's top offseason story line, as the Buckeyes could be a defensive line away from contending for a national title in 2013.
"We're not going to claim to be experienced," Vrabel told ESPN.com on Thursday, "but we're going to go out and continue to improve. They work, and they're committed to being great."
Vrabel is stressing three areas for the linemen this spring -- attitude, effort and toughness. If all three are achieved, Vrabel thinks the players can "let their God-given ability to take over."
The Buckeyes' linemen boast plenty of ability. Ohio State had arguably the nation's top defensive-line haul in the 2012 recruiting class, signing four ESPN 150 defensive linemen, three of whom -- Noah Spence, Adolphus Washington and Tommy Schutt -- saw the field as true freshmen. More help is on the way from the 2013 class with standouts like tackle Joey Bosa, an ESPN 150 selection. Two incoming line recruits, Tyquan Lewis and Tracy Sprinkle, enrolled early and are participating in spring ball.
"The guys we've got have a little bit of experience with Adolphus and Noah and Tommy," Vrabel said. "Michael Bennett and Joel Hale, Steve Miller, those guys have been here, contributing and giving us some leadership. And Tracy and Tyquan are just trying to figure their way through this thing.
"We're learning every day."
Although Ohio State's defensive line undoubtedly will be younger, Vrabel also thinks it will be faster with players like Spence and Washington, who finished third on the team with three sacks in 2012. Again, talent isn't a problem, but the line needs leadership after losing two-time captain John Simon.
Head coach Urban Meyer challenged several of the older linemen at the start of the spring, saying, "Steve Miller's been here for a while. It's time to go play. Chris Carter, how long has he been here? At some point you can't redshirt anymore." At the very least, Ohio State needs the veterans to fill out the line rotation.
Ideally, they can take the reins.
"No one's going to replace what John Simon provided for this program," Vrabel said. "We can only hope that we find guys who are willing to lead, be the same person every day, be competitive, play with some toughness and play with some effort. We'll have guys step up."
Vrabel should get an accurate gauge on his group this spring because of the men they'll be lining up against. What the Buckeyes lack in defensive-line experience, they make up for on their offensive line, which returns four starters with 81 combined career starts.
"If we can compete against them," Vrabel said, "we feel like we're going to be OK."
Spence evidently has been competing well, impressing Buckeyes offensive line coach Ed Warinner with his edge-rushing speed.
Vrabel's return to his alma mater in 2011 generated tremendous excitement, and he made an immediate impact on the recruiting trail. But his coaching skills will be under the microscope as he works with a group that, for now, is Ohio State's biggest question mark.
"I'm a young coach, I'm new to this, so every day is a challenge," he said. "I enjoy it, I embrace the challenge and try to do my best."