• 2.9 baseline — 0.6 × season 2.8 (11 gm) + 0.4 × last 10 3.1
• +0.2 opponent leak — they concede 59.5/game vs a 56.6 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.