• 9.7 baseline — 0.6 × season 10.1 (7 gm) + 0.4 × last 10 9.1
• −0.2 opponent leak — they concede 209.4/game vs a 213.6 league average
• −0.8 at this ground — averages 8.9 there (12 gm)
• vs them: averages 8.5 over 2 games — evidence, never summed

Most signals here point under while you're on the over — worth reading the working above before you commit.

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 21: 19 — far outside his usual range; kept in the average, not smoothed away.