• 7.3 baseline — 0.6 × season 7.5 (19 gm) + 0.4 × last 10 7.1
• +0.1 opponent leak — they concede 157/game vs a 155.4 league average
• at this ground: too thin to count (2 gm) — shown, adds nothing
• vs them: averages 6.9 over 8 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.