• 7.2 baseline — 0.6 × season 7.5 (21 gm) + 0.4 × last 10 6.7
• +0.3 opponent leak — they concede 192.6/game vs a 185.9 league average
• at this ground: too thin to count (3 gm) — shown, adds nothing
• vs them: averages 10.1 over 7 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.