• 0.1 baseline — 0.6 × season 0.2 (13 gm) + 0.4 × last 10 0.1
• +0.0 opponent leak — they concede 15.8/game vs a 12.2 league average
• +0.0 at this ground — averages 0.1 there (29 gm)
• −0.1 wet forecast — averages 0 in the wet (10 gm)
• vs them: averages 0.2 over 6 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 1: 1 — far outside his usual range; kept in the average, not smoothed away. Round 9: 1 — far outside his usual range; kept in the average, not smoothed away.