Gennings Dunker had seen the tape. He had studied the footwork, the hand placement, the way NFL defensive tackles can turn a gap into a slammed door in a half-second. But standing on the practice field during his first OTA session in a Steelers uniform, the rookie guard from Iowa understood something no film room could teach.
It's faster. A lot faster.
"You see it on film, but it's different when they're right in front of you," Dunker said after practice. "The speed is real. Guys are just moving. I'm adjusting. It's a jump."
The third-round pick in April's draft has spent the spring working with the second-team offensive line, rotating at both guard spots and getting occasional reps at right tackle. The Steelers drafted him at No. 96 overall expecting versatility and a mauler's mentality. What they are getting in these early practices is a rookie recalibrating his internal clock.
The jump from college to the NFL is nothing new; every player goes through it. But for an offensive lineman, the adjustment is uniquely brutal. A defensive tackle can cheat and recover. A guard cannot. One false step, one late punch, and the quarterback is eating turf.
Dunker's first few days have been a crash course in that reality.
He has gone against nose tackle Keeanu Benton, the third-year veteran who won the starting job in 2024 and never looked back. Benton is quick, strong, and knows exactly how to exploit a rookie's hesitation. Dunker has also faced off against defensive end Yahya Black, the 2025 fifth-round pick who has bulked up and refined his pass-rush moves. Those reps are the most valuable of the spring, but they are also the most humbling.
"You can't think as much," Dunker said. "You have to react. In college, you could get away with processing a little slower. Here, they're already gone."
That processing speed is the decisive variable. It is the difference between a lineman who starts as a rookie and one who spends the season on the sideline. For Dunker, the Steelers depth chart offers both opportunity and warning.
The starting interior line is set. Left guard is Spencer Anderson, the 2023 seventh-rounder who seized the job last season and played 17 games, starting 15. Center is Zach Frazier, a 2024 second-round pick who anchored the line as a rookie. Right guard is Mason McCormick, another 2024 pick who started all 17 games in his second season. That group allowed just 28 sacks last year, per team stats, a number that ranked eighth in the league.
But behind them, the depth is thin and unproven.
Doug Nester, an undrafted free agent from West Virginia, is competing for a backup role. Steven Jones and Aiden Williams are camp bodies who have yet to log a regular-season snap. The Steelers did not invest heavily in the interior this offseason, banking on the development of their young starters and the versatility of their rookies.
Dunker is their emergency plan but also a long-term investment.
If someone goes down -- and someone always goes down on an offensive line -- the Steelers will turn to him. That is the reality of the NFL. Dunker is not just learning a playbook. He is learning how to survive when the game slows down for everyone else but him.
The speed he is feeling now is not permanent. It never is. By training camp, the game will settle into a rhythm. The footwork will become instinct. The hand placement will become reaction rather than thought. The jump from college to the NFL is real, but it is also survivable.
Dunker has the frame and the pedigree. He started 35 games at Iowa, a program that has produced a parade of NFL offensive linemen. He knows the techniques. He knows the schemes. The question is how quickly he can translate that knowledge into the kind of split-second decisions that the NFL demands.
The Steelers offensive line coach -- a veteran with a reputation for developing mid-round picks -- has been on him in every drill. Dunker is getting coached hard. He is getting corrected on every rep. That is the only way to compress the learning curve.
"I'm taking it day by day," Dunker said. "Coach is staying on me. The older guys are helping me out. It's a process, but I feel like I'm getting there."
He is getting there. The gap between college and the NFL does not close overnight. It closes in small increments. One rep. One practice. One correction. By the time August arrives, Dunker will have taken hundreds of snaps against professional defensive linemen. The speed will still be there. But it will not feel the same.
That is the goal. Not to eliminate the speed, but to make it normal.
The Steelers did not draft Dunker expecting him to start as a rookie. They drafted him because they like his floor as a backup and his ceiling as a future starter. He plays with leverage, he finishes blocks, and he has the kind of quiet durability that offensive line coaches covet. But those traits mean nothing if he cannot handle the speed.
So far, he is handling it. Not dominating it. Not yet. But handling it.
The veteran defensive linemen have noticed. They have seen rookies come through before, some who panicked and some who settled. Dunker is in the latter group. He is getting beat. He is being taught. He is showing up the next day and trying again.
For a third-round pick in June, that is not just acceptable. That is progress.
The real test will come in padded practices during training camp. That is when the speed becomes violence. That is when a gap-closing defensive tackle can knock a rookie backward and into the turf. That is when the speed Dunker is feeling now becomes something else entirely.
But for now, he is where he needs to be.
"I'm excited," he said. "It's a challenge. That's why I'm here."
The Steelers have built their offensive line around youth and continuity. Frazier, McCormick, and Anderson are the present. Dunker is part of the future. But the future always arrives faster than anyone expects. And when it does, the rookie from Iowa will be ready.
He is adjusting. Every day. One rep at a time.