Dolphins DC Vic Fangio? No. Mike Hafley points to Kenneth Grant’s growth after rookie transition

Miami Dolphins defensive coordinator Mike Hafley is publicly taking stock of how Kenneth Grant handled his first year in the NFL, and the message is straightforward. Hafley, speaking about Grant’s development, said, “I think he’s taken a step forward,” framing the offseason work as evidence that the young interior defensive lineman is no longer just adjusting to the pro game, but starting to trust it.

Grant arrived in Miami with expectations that come attached to first-round draft capital. The Dolphins selected him with their first-round pick in the 2025 NFL Draft, and, like many rookies, he needed time to settle into the speed, strength, and technique demands of the league. According to reporting from Yahoo Sports, the concern was not effort, but acclimation: learning how to turn raw traits into consistent production across downs.

By the end of his first season, Grant had accumulated a stat line that suggests both flashes and a player still building a baseline. Yahoo Sports reported that he finished with 33 combined tackles, two tackles for loss, five quarterback hits, and two sacks. Those numbers do not place him in the same conversation as an every-week disruptive interior force, but they also show he found ways to reach the quarterback and impact plays even while the transition was still underway.

Hafley’s praise, as described in the same report, focuses less on a single measurable outcome and more on the process. He highlighted that Grant has transformed his body and regained confidence, which matters because interior linemen are judged as much by repeatability as by peak moments. For a defensive tackle, “confidence” often shows up in cleaner leverage, better hand placement, steadier gap integrity, and less hesitation when the pocket shifts and linemen must win at contact rather than after it.

That context puts Grant’s second-year outlook in sharper relief. The Dolphins have spent time building a defensive identity around pressure and sound fundamentals, and the interior has to do its share, especially when offenses try to manage edge threats with chips, counters, and quick-game spacing. If Grant’s offseason routine has indeed changed his physical readiness and his comfort level on game days, Miami’s defensive staff will likely look for an improvement that shows up in the middle of drives, not just in isolated plays.

The central caveat is that offseason statements, even from a coordinator, are not guarantees. A body transformation can take time to translate into snaps, and confidence can fluctuate as a player faces different looks, injuries in training camp, and the standard preseason adjustments. Still, first-round expectations create a clear target for what “a step forward” should mean for Grant: more consistent interior pressure, better run defense discipline, and more frequent conversions from his rush reps into quarterback-impacting moments.

What to watch next is whether Hafley’s comments turn into visible changes in practice habits and rotation usage. If Miami uses Grant more assertively early, or asks him to take on tougher double-team responsibilities, that would be a tangible sign that the staff believes the growth is real. In the coming months, the most telling indicator will be whether Grant’s technique is cleaner when the team faces live offensive fronts, and whether his production suggests he has moved from acclimating to dominating his assignments more often.

For Dolphins fans, the storyline is familiar but important: turning a learning year into a developmental jump. Grant’s first season provided enough evidence that the talent is there, and Hafley’s endorsement suggests Miami believes the preparation is now catching up with the player’s ceiling. The next test is whether that belief holds when games begin to count again.