The first signings of the new league year tell you more about organizational philosophy than the headline numbers suggest. Ignore the contract values for a moment and look at what positions are being filled and by what kind of player.

The teams that understand offensive line construction are identifiable by the end of day one. They are the teams signing guards and centers at prices that reflect the market — not below-market bargains they stumbled into. Below-market offensive line signings are almost always below-market for a reason: a technique problem, a medical flag, a scheme-fit question. The teams that are good at this position group pay what the position is worth and then develop the player within a system that maximizes what he does well.

The interior player who drew the most attention on day one: the center who was allowed to walk in free agency by a team that thought it could replace him and is now watching his new organization build an offensive identity around what he provides. The teams evaluating him asked the right question — not what his production was, but what the production would look like without him. Centers are the position where absence is the most honest diagnostic.

What the tape shows about the interior players who signed Wednesday: the most consistently excellent center available in this free-agent class protects the interior through combination blocking at a rate that pro day numbers don't capture because combination blocking doesn't show up in individual workout drills. He moves well laterally, he finishes blocks through the whistle, and he calls line protections at a speed that defensive coordinators have begun designing blitz packages specifically to disrupt. The team that signed him paid correctly.

The guard market produced one genuinely below-value signing — a player whose tape from the last two seasons shows consistent execution in gap schemes at a price that reflects concern about his ability to operate in zone concepts. That concern is legitimate. It is also solvable, by a team with an offensive line coach who understands footwork correction. Whether his new team has that coach will determine whether the contract is a bargain or a mistake.

The defensive tackle market is where teams consistently overpay, and day one was no exception. Pass-rush production from the interior is the hardest thing to project from one defensive system to another because so much of what makes an interior rusher effective is scheme-dependent. The player who produced eight sacks as a three-technique in a two-gap system is not the same player in a one-gap system. Read the tape. Not the production. The tape.

Day one signings are the decisions that will matter in November. Watch which ones reflect film study and which ones reflect panic.