• 6.4 baseline — 0.6 × season 6.4 (5 gm) + 0.4 × last 5 6.4
• −0.1 opponent leak — they concede 209.2/game vs a 213.6 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.