• 19.4 baseline — 0.6 × season 19.4 (8 gm) + 0.4 × last 8 19.4
• −1.4 opponent leak — they concede 343.2/game vs a 369 league average
• at this ground: too thin to count (1 gm) — shown, adds nothing

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.