from 6.5 baseline, −0.9 at this ground

• 6.5 baseline — their last 10 games; only 0 this season, too few to blend
• +0.3 opponent leak — they concede 224.1/game vs a 213 league average
• −0.9 at this ground — averages 8.9 there against his own 11.6 in those same seasons — 86% of his own level (7 gm)
• vs them: averages 12.0 over 7 games — 99% of his own level in those seasons — 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.