• 2.0 baseline — his last 10 games; only 2 this season, too few to blend
• −0.1 opponent leak — they concede 181.2/game vs a 186.3 league average
• −0.5 at this ground — averages 1.5 there (13 gm)
• vs them: averages 2.0 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 15: 8 — far outside his usual range; kept in the average, not smoothed away.