• 49.5 baseline — 0.6 × season 49.5 (6 gm) + 0.4 × last 6 49.5
• +0.8 opponent leak — they concede 1715.2/game vs a 1686.6 league average
• at this ground: too thin to count (1 gm) — shown, adds nothing
• wet forecast: too thin to count (2 gm) — shown, adds nothing
• vs them: averages 31.0 over 1 game — 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.