• 5.2 baseline — his last 10 games; only 1 this season, too few to blend
• +0.1 opponent leak — they concede 378.4/game vs a 369 league average
• +1.3 at this ground — averages 6.5 there (18 gm)
• vs them: averages 10.0 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. Round 18: 9 — far outside his usual range; kept in the average, not smoothed away.