• 4.1 baseline — his last 10 games; only 2 this season, too few to blend
• −0.2 opponent leak — they concede 200.8/game vs a 213.6 league average

Derived, not measured — plain arithmetic over his real games, shown in full. Adjustments can overlap (a game at this ground can also be a wet one); they add simply, and this note is the admission.