One broken ankle changed everything. Before Bo Nix went down in overtime of Denver's win over Buffalo, lookahead lines had the Broncos as 1.5-point favorites over New England in a potential AFC Championship matchup. Now? The Patriots are laying 5.5 points.

That's a seven-point swing because of a backup quarterback.

The Quick Hit

• What happened: Bo Nix's season-ending ankle injury flipped the AFC Championship line
• The damage: Patriots -5.5, O/U 41.5, Pats -255 moneyline
• Why you should care: Jarrett Stidham is starting an AFC Championship game
• The move: The sharps have already knocked it from -5.5 to -5 at some books

The Jarrett Stidham Reality Check

Jarrett Stidham hasn't started an NFL game since 2023. He has four career starts total. He's about to play in an AFC Championship game at Mile High against a Patriots defense that just dominated the Texans 28-16.

This is not a fair fight on paper.

The Patriots just held Houston to 16 points with Drake Maye continuing his MVP-caliber season. New England's defense has been a problem for everyone they've faced in these playoffs. Now they're going against a guy who was comfortably on the bench two weeks ago.

But Wait, The Line Is Moving Back

After opening at Patriots -5.5, some shops have already ticked down to -5. That suggests someone with money believes Denver isn't completely dead here.

The Broncos' defense remains elite. Their running game can control clock. Stidham doesn't need to be a hero—he just needs to not be a disaster. If Denver can make this ugly and low-scoring (that 41.5 total is one of the lowest we've seen in an AFC Championship), Stidham has a chance to steal one.

That said, the sharps who hammered the Bills-Broncos line back and forth all week might just be playing contrarian again. Betting against the Patriots with Drake Maye seems foolish, but that's what makes gambling fun.

Super Bowl Odds Update

New England sits at +270 to win the Super Bowl, making them the betting favorite among the final four teams. That gap between them and Denver (+1100) tells you everything about how the market views Stidham's chances.

On the NFC side, the Seahawks host the Rams as 2.5-point favorites in what should be a higher-scoring affair. Seattle and Los Angeles have split their two meetings this season, with both games coming down to the wire.

Historical Context

Home underdogs in the AFC Championship game have actually fared reasonably well historically. Denver has Mile High advantage and a crowd that will be absolutely desperate to send their team to the Super Bowl.

But those historical samples didn't involve a quarterback making his fifth career start in January against a playoff-tested defense. Stidham is walking into a buzz saw.

The Bottom Line

The market has spoken: losing your starting quarterback in the playoffs is worth about seven points against the spread. New England should roll, which means New England probably won't roll—because that's how these things work.

The Patriots opened the season as a rebuilding team. Now they're a touchdown favorite in the AFC Championship. Drake Maye has been the story all year, and he's about to have the biggest stage of his young career.

Sunday at 3 PM ET. Empower Field at Mile High. Book it.