How Jack Campbell Became the Core of the Lions’ Defense
Inside Detroit Lions linebacker Jack Campbell’s breakout sophomore season and how he became the physical identity of Aaron Glenn's defense.
Drafting an off-ball linebacker in the first round is a gamble in the modern NFL. When Detroit Lions general manager Brad Holmes took Jack Campbell 18th overall in 2023, the critics quickly emerged. Analysts questioned the positional value. Fans wondered if a throwback, downhill defender from Iowa could survive in a league dominated by speedy, space-oriented offenses.
A year later, those doubts are fading fast.
As the Lions push toward the midpoint of the season, Campbell has emerged not just as a reliable starter, but as the physical identity of Aaron Glenn’s defense. He is playing faster, hitting harder, and thinking less. The hesitation that occasionally plagued his rookie campaign has been replaced by a violent, decisive style of play that is making life miserable for opposing run games.
Finding the Right Trigger
Last year, Campbell looked like a rookie trying not to make mistakes. He was often a step slow to react, caught between his instincts and the complex adjustments of Glenn’s scheme. That is normal for young linebackers. The transition from college to the pros is brutal at this position because of the pre-snap responsibilities.
This year, the game has clearly slowed down for him. You can see it in how he triggers on the ball. When a run play develops, Campbell isn’t waiting for the block to come to him anymore. He is meeting offensive linemen in the hole, shedding them with his 244-pound frame, and making the tackle at or behind the line of scrimmage.
“You can feel his presence on the field,” head coach Dan Campbell said recently. “He is playing with a level of violence and speed that we saw on his college tape, but now he’s doing it against NFL offensive lines. He’s trusting what he sees.”
The Statistical Leap
The eye test matches the numbers. Campbell’s run-defense grades have skyrocketed compared to his rookie year. According to analysts tracking defensive stop percentages, he has become one of the most efficient run-stoppers in the league, consistently grading out among the top linebackers in run-defense efficiency.
Here are some of the areas where Campbell has made his biggest statistical impact this season:
- A significant drop in missed tackle percentage, down to single digits.
- An increase in defensive stops—tackles that constitute a failure for the offense.
- Improved depth of tackle, averaging nearly a yard closer to the line of scrimmage than last season.
It is not just about stopping the run, though. In pass coverage, Campbell has shown better awareness in his zone drops. He is using his massive 6-foot-5 frame to clog passing lanes, making life difficult for quarterbacks trying to find targets over the middle. While he will never be a safety-hybrid type of defender, his positioning has kept him from being exploited in space.
The Anzalone Influence
Every young linebacker needs a mentor, and Campbell has found a great one in veteran Alex Anzalone. The two have formed a formidable duo in the heart of Detroit’s defense. Anzalone’s communication skills and deep understanding of the system have allowed Campbell to play more freely.
When Anzalone is setting the front, Campbell can focus on hunting the ball. This partnership has allowed defensive coordinator Aaron Glenn to get creative with his packages. He can trust both players to handle their responsibilities without needing safety help over the top, which frees up the secondary to play more aggressive man coverage.
“Alex has been huge for me,” Campbell admitted after a recent practice. “Just watching how he prepares, how he sees the game before the snap. It helps me play with that extra bit of confidence. I don’t have to guess. I know where my help is.”
The Mid-Season Grunt Work
As the weather cools down and the season enters the grueling winter stretch, physical defense becomes more important than ever. The Lions are positioning themselves for a deep playoff run, and to get there, they need to control the line of scrimmage. Campbell is built precisely for this stretch of the calendar.
His coaches appreciate his blue-collar work ethic. He is often the first in the film room and the last to leave the practice field. That dedication is paying off in real-time. In high-leverage situations—third-and-short, red-zone stands, fourth-quarter drives—Campbell has consistently come up with the stop Detroit needed.
There are still areas to polish. Elite passing offenses will still try to isolate him on speedy running backs in the flat. But the days of viewing Jack Campbell as a liability in any phase of the game are over. He has earned his spot as a core pillar of this defense, proving that the Lions’ front office knew exactly what they were doing when they ignored the critics on draft night.
