Jim Harbaugh has been building football teams his entire adult life and the offseason he has run in Los Angeles tells you everything about how he believes the game is won.

Three offensive linemen. That is what Harbaugh went and got. Center Tyler Biadasz. Guard Cole Strange. Tackle Trevor Penning. Three starting-caliber offensive linemen in the space of four days. The Chargers lost interior depth from last year's line and replaced it with a center who was a first-round pick in Dallas, a guard who played under the new offensive coordinator in Miami, and a tackle who has the physical profile Harbaugh's offense has always prioritized — long, powerful, capable of driving defenders laterally in the run game.

I want to talk about what this group means for Justin Herbert, because that is the actual question.

Herbert is one of the five best quarterbacks in the league by pure talent. What has limited his production numbers over the years is not his arm, not his decision-making, and not his accuracy — it is the amount of time he has had to operate. The quick-pressure situations where Herbert's mechanics break down slightly are the same situations that break down most quarterbacks' mechanics. The difference is that for Herbert, those situations have been a recurring feature of his offense rather than an occasional occurrence. Biadasz is a technically sound center who handles interior pass-rush games more reliably than the player he replaces. Strange, if the Miami connection with the new offensive coordinator holds, brings a schematic familiarity to the left side of the interior that does not require a half-season of installation. Penning has the physical tools to develop into a right-side anchor at tackle.

The philosophical point Harbaugh is making is simple and it is the same point he has made at every level of football he has coached: the game is won at the line of scrimmage, and the quarterback you are protecting cannot show you what he can actually do until you give him a real pocket. In San Francisco, Harbaugh had a center in Jonathan Goodwin and a line that was a pillar of one of the best offenses in football. He is trying to build something similar in Los Angeles.

Khalil Mack is returning. The defensive line was not the problem. The pass-blocking protection was the problem. Harbaugh has named the problem and addressed it directly in the first week of free agency.

The offense also added fullback Ale Ingold, tight end Charlie Kolar, and running back Keaton Mitchell — functional pieces that fill specific roles within a physical, play-action system. None of those players is a headline. All of them are the kind of player that a Jim Harbaugh offense requires to function the way the drawing board says it should.

Go back and watch the Harbaugh-era San Francisco offenses when the line was healthy and the full personnel group was available. What you see is a team that controlled possession, won the line of scrimmage on first and second down, and then had the explosive plays in the passing game because the defense was compromised by having to stop the run first. That is what Harbaugh is building in Los Angeles, and the three offensive linemen he added this week are the foundation he was missing.

Whether Herbert responds to a real pocket the way the film suggests he can is the question 2026 will answer. The film says yes. The offensive line says the test is finally going to happen.