Dolfan Radio | The Defense
By Brad Michaels • July 7, 2026
He will call it a 4-3 because that is the base. He will play 3-4 structures out of the same group so he does not have to sub. Front variation is the point. The label is not.
Jeff Hafley is a first-time NFL head coach who already ran a top-12 defense in Green Bay. He brought Sean Duggan with him to put that language on the call sheet. The Miami version is not a copy of last year’s Packers. It is the same bones on a younger body.
The last two Dolphins regimes lived in 3-4 clothing. Hafley is flipping the base: four down linemen, three linebackers, nickel as the real Sunday package. Then he wants to show you odd fronts without changing the personnel, so the offense cannot listen for substitutions and know what is coming.
“You might say we’re going to be a 4-3 defense, which we’ll base out of 4-3, but I like to get in the 4-3 structures and 3-4 structures all out of the same personnel groupings so I’m not subbing. Front variation is huge.”
— Jeff Hafley, February 2026
Four down. Wide-9 edges. Interior players one-gap and climb, not two-gap and hold. Sieler is the grown-up. Grant was supposed to be next to him.
Set it or the run bounces. Chop is the Year 3 bet. Everybody else in that room is a rotation or a rookie until they prove they can play tight ends.
Cover-3 family with press at the corners and two-high looks mixed in. Johnson is the first-rounder. The safety room was still a competition after cutdown.
A 9-technique lines up outside the tackle. Duggan has already said they will live there sometimes because it gives the rusher a clean angle and because it takes space away from the runner. The ball is supposed to bounce inside, where the linebackers are waiting. If the edge loses, the whole drawing collapses and you are chasing stretch plays to the numbers.
That is why the Chop piece is not a separate conversation. The scheme assumes an edge who can rush and set. Miami has not had that player on a full snap count in two years. Uche is light for the job. The rookies are rookies. Sieler can eat blocks inside. He cannot play nine-technique.
Green Bay under Hafley lived in Cover-3 more than a third of the time. Press at the corner. Pattern match, not freelance. Safeties who can walk down and still get back. That only works if the rush arrives. A young secondary playing behind a four-man rush that does not get there is how you give up the explosive you just spent all spring saying you would take away.
Chris Johnson is the draft capital. JuJu Brents and Jason Marshall Jr. stayed. Reese Taylor and Marcellas Dial Jr. came off the wire. Storm Duck and Darrell Baker Jr. miss the first four on reserve/PUP. Julius Wood is a fourth safety in a room Hafley still called a competition after the first 53. Believe him. Scheme does not cover for missed tackles and late eyes.
| Room | What the scheme asks | What Miami actually has |
|---|---|---|
| Interior | One-gap climb, wreck the mesh | Sieler. Grant on IR. Young depth behind that. |
| Edge | Wide-9 set and rush | Chop as the starter. Everyone else is a question. |
| Linebacker | Clean fits, no wasted steps | Brooks and Rodriguez. The kid won the job. Now he has to keep it. |
| Secondary | Press, match, tackle | A first-rounder and a competition. Four games before two corners even return. |
The Chop essay is the player version of this. The season preview is the record version. This one is the drawing. Week 1 at Allegiant is the first time anyone has to block it.
Is this a scheme with teeth or a scheme with names? You will know by the time the first four are in the books. Leave it in the comments.