• 6.2 baseline — 0.6 × season 6.2 (6 gm) + 0.4 × last 6 6.2
• −0.1 opponent leak — they concede 360.2/game vs a 369 league average
• at this ground: too thin to count (3 gm) — shown, adds nothing
• vs them: averages 4.0 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 6: 13 — far outside his usual range; kept in the average, not smoothed away.