• 1.2 baseline — 0.6 × season 1.2 (10 gm) + 0.4 × last 10 1.2
• +0.2 opponent leak — they concede 11.6/game vs a 9.7 league average
• vs them: averages 0.0 over 1 game — 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.