• 10.2 baseline — 0.6 × season 9.9 (16 gm) + 0.4 × last 10 10.8
• −0.6 opponent leak — they concede 201.8/game vs a 213.6 league average
• −2.6 at this ground — averages 7.7 there (28 gm)
• vs them: averages 4.0 over 4 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.