• 15.8 baseline — his last 10 games; only 2 this season, too few to blend
• −0.2 opponent leak — they concede 211.2/game vs a 213.6 league average
• at this ground: too thin to count (3 gm) — shown, adds nothing
• vs them: averages 12.4 over 9 games — evidence, never summed

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.