• 5.0 baseline — 0.6 × season 5.2 (11 gm) + 0.4 × last 10 4.8
• −0.0 opponent leak — they concede 154.7/game vs a 155.4 league average
• −0.9 at this ground — averages 4.1 there (10 gm)
• vs them: averages 3.5 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.