• 4.1 baseline — 0.6 × season 4.1 (8 gm) + 0.4 × last 8 4.1
• −0.2 opponent leak — they concede 88/game vs a 93.4 league average
• at this ground: too thin to count (1 gm) — shown, adds nothing

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 15: 9 — far outside his usual range; kept in the average, not smoothed away.