• 5.4 baseline — 0.6 × season 5.7 (20 gm) + 0.4 × last 10 5.0
• +0.0 opponent leak — they concede 94/game vs a 93.4 league average
• −1.2 at this ground — averages 4.3 there (4 gm)
• vs them: averages 4.2 over 5 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. Opening Round: 13 — far outside his usual range; kept in the average, not smoothed away.