Seattle Seahawks at Arizona Cardinals. Pick: Arizona Cardinals +4.5. Pick: Under 41.5.

Spread.Edge Labs makes Seattle -5.2, only 0.7 points beyond this market, but its Darnold assumption misses the most consequential news. Seattle reports a glute injury with no firm return timeline; Lock is the likely replacement if Darnold cannot play. My judgmental fair line is approximately Seattle -3 assuming Lock starts, rather than a mechanically recalibrated model output. Arizona's 26-14 opening win under Mike LaFleur supports reassessing its preseason weakness, although one result cannot establish a turnaround. Much is already priced: the dossier's early Seattle -9.5/-10 quotations preceded the latest quarterback information, so that entire move is not fresh betting evidence. Seattle's defensive quality, four extra rest days and Lock's productive relief appearance argue against excessive enthusiasm for Arizona. Nevertheless, +4.5 protects a field-goal or four-point defeat. I prefer the home points, with conviction limited by Darnold's unresolved availability and Arizona's unconfirmed Week 2 injury statuses. Sources and dates supporting these inputs follow.

Total.The bias-corrected model total is 45.3, still 3.8 above market: the over deserves consideration. Lock completed 16 of 22 passes for 187 yards and a touchdown, Arizona scored 26 in its opener, and an expected closed roof should support offensive execution. Secondary availability remains another over risk. The under case is Darnold's uncertain availability, Fleury's reported run-first approach and Seattle's defense, which held New England to 10 points and 277 yards. I infer a conservative Seattle plan, but cannot verify a current pace statistic. My subjective total is around 40 with Lock starting. Under is therefore a small lean, sensitive to quarterback news, rather than the strong position that blindly fading the model might suggest.

Where our number looks wrong.The projected healthy-Darnold baseline and zero QB-disruption layer are materially stale. Seattle also changed offensive coordinators to Brian Fleury despite retaining its head coach. The total's 46.5 becomes 45.3 after the stipulated 1.2-point bias correction, before accounting for quarterback uncertainty. Neither model has demonstrated an edge that justifies overriding those omissions. The injury scan contains Week 1 statuses, not current availability. Also audit the spread sign metadata: raw_margin_home -2.5 and calibrated home +5.2 point in opposite directions under the stated convention.

Spread.The headline our number never saw: Sam Darnold (glute) is ruled OUT, and Drew Lock (10-18 career) starts for Seattle (Field Gulls/Arizona Sports, 9/13-9/14). Our rating projects Darnold and lands Seattle -5.2 vs a market ~-4.3; strip the QB out and our own number should fall well below the market, which flips this toward the points. At 4.5 you get a home division dog, off an upset road win at the Chargers, laying the QB downgrade back onto a road team on its backup. Seattle's elite defense (17.2 ppg allowed 2025) keeps this close and is the reason this is a lean, not a hammer, but a field goal plus the hook at home against a Lock-led offense is the better side.

Total.Both offenses are quarterbacked below their season plan: Seattle on Drew Lock in place of Darnold, Arizona on placeholder Jacoby Brissett (28th in QBR 2025). Point that into Seattle's elite defense (17.2 ppg allowed, best def EPA in the dossier at -0.112) and the low-scoring profile is real. The market agrees, dragging the total from a 44.5 open to 41.5 on the Darnold news. Our totals model screams Over 46.5, but it still assumes Darnold, admits it runs ~1.2 pts high and grades worse than the market on holdout, I discount it here. Dome removes any weather swing. The number is already low, so this is a modest lean rather than a strong one; a Lock turnover or a McBride/Love spark could push it over.

Where our number looks wrong.Our -5.2 is built on Sam Darnold at QB. Darnold is OUT and Drew Lock starts; the rating cannot read that and overrates Seattle. Adjusted for the downgrade our number should sit below the market's 4.5, not above it, the model is stale on the single most important fact in this game.

Spread.Sam Darnold (glute) is out for Seattle; Drew Lock starts, per NFL.com and ArizonaSports (2026-09-14). This is the driver of the pregame line collapse (DraftKings' lookahead had Seattle -10, now -4.5 per Field Gulls and the dossier's 2026-09-15 capture). Our rating model's 5.2-point home-underdog number for Arizona was built on full-season 2025 data with Darnold starting all year; it has no in-week mechanism for a one-game backup-QB swap beyond the season-level qb_returning flag, so it is a step behind this news even before market data is applied. The market itself may not be fully repriced either: Covers.com's own fair-value read (2026-09-15) lists Arizona +3.5, half a point better for Arizona than the +4.5 on the board. Arizona is coming off a real result, a 26-14 upset of the Chargers as 9.5-point dogs, outgaining LA 393-268 with 37+ minutes of possession (NBC Sports/PFN, 2026-09-13/14), and Lock, functional in relief (16/22, 187 yards, TD), is still a clear downgrade on the road in a division game. Take Arizona +4.5.

Total.Market total sits at 41.5, well under our totals model's 46.5 (whose own holdout bias runs about 1.2 points high, so call it ~45.3 fair, still a large gap). That model number predates the Darnold news and only reads QB continuity in aggregate, not the specific downgrade to Drew Lock in a road division game. Seattle's defense allowed the league's fewest points per game in 2025 (17.2) and returns under Mike Macdonald; Arizona's defense, poor in 2025, showed real signs of life in Week 1 (a blocked punt, sacks on Herbert, 14 points allowed to a playoff-caliber Chargers team). Seattle's own Week 1 with Lock playing extensively finished 13-10. Division game, backup QB, two improving defenses: take Under 41.5.

Where our number looks wrong.The rating has no in-week injury feed for a starting-QB change; it is still pricing Seattle with Darnold's full 2025 production baked in via the season-level qb_returning flag, so its 5.2-point home-underdog number for Arizona is a step behind the news the market has already partly absorbed.