• 10.4 baseline — 0.6 × season 9.8 (16 gm) + 0.4 × last 10 11.2
• −0.7 opponent leak — they concede 345.4/game vs a 369 league average
• vs them: averages 8.0 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.