• 0.3 baseline — 0.6 × season 0.4 (17 gm) + 0.4 × last 10 0.2
• +0.1 opponent leak — they concede 5.2/game vs a 4.2 league average
• vs them: averages 0.2 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. Round 9: 3 — far outside his usual range; kept in the average, not smoothed away.