• 11.3 baseline — 0.6 × season 11.6 (8 gm) + 0.4 × last 10 10.7
• −0.7 opponent leak — they concede 200.8/game vs a 213.6 league average
• vs them: averages 8.3 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.