• 7.3 baseline — 0.6 × season 8.3 (7 gm) + 0.4 × last 10 5.8
• +2.0 opponent leak — they concede 44.8/game vs a 35.3 league average
• −2.6 at this ground — averages 4.7 there (6 gm)
• vs them: averages 3.0 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. Round 10: 19 — far outside his usual range; kept in the average, not smoothed away.