• 0.1 baseline — 0.6 × season 0.1 (15 gm) + 0.4 × last 10 0.0
• +0.0 opponent leak — they concede 10.2/game vs a 9.7 league average
• +0.2 at this ground — averages 0.3 there (38 gm)
• +0.2 wet forecast — averages 0.3 in the wet (13 gm)
• vs them: averages 0.3 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. Round 2: 1 — far outside his usual range; kept in the average, not smoothed away. Round 4: 1 — far outside his usual range; kept in the average, not smoothed away.