• 0.3 baseline — his last 10 games; only 2 this season, too few to blend
• +0.1 opponent leak — they concede 16.4/game vs a 12.2 league average
• −0.2 at this ground — averages 0.1 there (7 gm)
• wet forecast: too thin to count (2 gm) — shown, adds nothing
• vs them: averages 0.3 over 3 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.