A rating is how good he is. Availability is how much of him you get.
Every other actor in the engine moves how good a player is. The medical lead moves something no one else measures: how much of that player is available, and how reliably he stays on the pitch. Football is an injury-heavy game, so this is a first-class read, and it is a genuinely new one. The engine strips out the two things that dominate raw injury counts, the squad's own fragility and the manager's training load, and credits the named medical lead only with what survives. It changes the expected value of a player, never his rating.
He does not make a player better. He keeps him on the pitch.
Every rating in the engine answers how good. The medical lead answers a different question the ratings never touch: how much of the player do you actually get across a season. A brilliant player who plays half the matches and a good one who plays them all are completely different bets, and the gap between them is availability. This is an availability and durability signal, not a quality one.
Neither rating is wrong, and neither moves. What the medical lead changes is the second number, how many of the thirty-eight a player is fit for, and over a season that number decides how much of the rating you actually bank. A recruitment read that stops at the rating is only half the bet. Talent is what a player can do. Availability is how often he is there to do it.
Illustrative engine read on the real availability-and-durability signal (matches-available rate, return-to-play, recurrence of soft-tissue injuries; a quality-independent read). Composite players, demonstration figures.
Most of an injury count is not the doctor. Subtract that before you judge him.
Raw injury numbers are misleading, because two things the injury-risk research shows dominate them are not the medical lead's doing: how fragile the squad already is, and how hard the manager works it. The engine normalises both out. Only the availability variance that survives both subtractions is attributed to the named medical lead.
This is the honest attribution the raw table cannot give. A medical lead at a club with an old, brittle squad and a manager who never rotates will show ugly raw numbers that are mostly not his fault, and one at a young squad with a careful manager will flatter a mediocre operator. The engine refuses to credit or blame him for the roster he was handed or the load someone else chose. Judge the doctor on the injuries the squad and the schedule do not already explain.
Illustrative engine read on the real two-confounder normalisation (raw availability minus roster injury-risk profile minus training-load exposure; only the surviving residual attributed to the medical lead). Composite squad, demonstration figures.
Same player, same number. A different amount of him, and a different bet.
A strong, portability-validated medical lead raises a player's expected availability, which raises the realised value of the bet on him without touching his rating. A durable player and a fragile one with the same traits have the same number; the medical read is a condition on the bet, reported alongside it, exactly the way the referee is a condition on a match rather than a change to anyone's ability.
This is why the medical lead sits beside the ratings and not inside them. His fingerprint decides how much of a player's quality a club banks over a season, and whether a development or transfer bet pays out as often as the rating implies, and like every other portable actor it is trusted only once it reproduces at another club. The rating is the ceiling. Availability is how often you reach it.
Illustrative engine read on the real condition-on-the-bet structure (availability-adjusted expected value, portability validation) and the no-KR-mutation rule. Composite player, demonstration figures.
Talent tells you what a player can do; it says nothing about how often he is fit to do it, and in an injury-heavy sport that second question decides how much of the talent a club actually banks. The medical lead is the named person who moves that number, and the engine measures him honestly: it strips out the squad's own fragility and the manager's training load, the two things that dominate raw injury counts and belong to other people, and credits him only with the availability that survives. It never touches the rating, because a durable player and a fragile one with the same gifts are equally good and differ only in how much of that good you receive. The read is a condition on the bet, reported beside the number, and it is trusted only once it travels with the person to the next club. The rating is the ceiling. Availability is how often you reach it.
Rate the ability once. Then read how much of it you get.
The Medical Lead read isolates availability from quality, strips out the squad and the schedule, and conditions the bet on how much of a player you can actually field, never his rating.