• 0.1 baseline — 0.6 × season 0.1 (19 gm) + 0.4 × last 10 0.1
• −0.0 opponent leak — they concede 10.2/game vs a 12.3 league average
• at this ground: too thin to count (3 gm) — shown, adds nothing
• −0.1 wet forecast — averages 0 in the wet (13 gm)
• vs them: averages 0.1 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.