Jacksonville's 4-1 Start Was Built on Defense and Special Teams. Week 6 Tests Both.

The Jacksonville Jaguars are 4-1 and alone atop the AFC South, and they have gotten there in a way that should make anyone watching both impressed and a little nervous.

The numbers tell a strange story for a team with Trevor Lawrence at quarterback. Jacksonville is scoring 24.6 points a game, which is fine — 349.0 yards of offense, a 50.2/49.8 pass-run split, nothing that scares anybody. What is carrying this team is everything else. The Jaguars have allowed just 14.0 points per game and 70 points total across five games, one of the stingiest marks in football. Their plus-10.6 point differential is the third time in five weeks they have won by multiple scores or squeezed out a one-possession game with defense.

That was never more obvious than Sunday in London, where Jacksonville beat Philadelphia 19-17 at Tottenham Hotspur Stadium. Lawrence was good — 331 passing yards, two touchdowns, a 95.1 rating, his best volume day of the season — but the game turned on DaVon Hamilton blocking a kick. A 4-1 team whose signature win required special teams to seal it is a team living on thin margins.

The Formula Is Working, Which Is the Problem

Lawrence has been steady all year: 1,174 yards, 10 touchdowns, three interceptions, 67.1 percent completions, a 106.8 passer rating. He has thrown for multiple scores in three of five games and has not had a disaster outing yet. He has also been sacked 10 times, and the offense has stayed deliberately balanced — rookie back Bhayshul Tuten (349 rushing yards on 82 carries, 4.3 a pop) has been the beneficiary, with Parker Washington (70.4 receiving yards per game) and tight end Brenton Strange (47.0) doing the heavy lifting through the air.

That is a team managing games rather than dictating them. It works when the defense is forcing takeaways — Jacksonville is plus-5 in turnover differential on the season — and it becomes uncomfortable when the game gets fast.

Now the Injuries Are Piling Up in the Wrong Spots

Two pieces of news from the past week matter more than the win itself.

The first is Anton Harrison. The Jaguars' left tackle suffered a serious knee injury against the Eagles, and Jacksonville will turn to Walker Little in his place. For a team whose entire formula depends on Lawrence staying upright and the run game staying on schedule, losing a starting tackle is the single most damaging kind of injury — and it arrives in a week defined almost entirely by an opponent that lives in the backfield. Houston is generating 3.6 sacks per game, among the best marks in the league.

The second is quieter but worth flagging: long snapper Ross Matiscik is injured, and the Jaguars are bringing in a replacement. A new long snapper means a new battery on every field goal and punt — snap, hold, placement, timing. For a team that won its biggest game of the season on a blocked kick, and that may need special teams to bail it out again, a change at that position is a live vulnerability.

Add a secondary already stretched thin — Eric Murray is doubtful with a concussion, Caleb Ransaw is on injured reserve, Yasir Abdullah is out with a hamstring — and the depth that made this defense look so sturdy is being tested for the first time.

What Week 6 Actually Asks

Jacksonville's next assignment is a divisional one: Houston, at Wembley, another 9:30 a.m. ET kickoff, with the Jaguars as the designated home team.

Do not be fooled by the Texans' 1-4 record. Houston is averaging 359.4 yards per game — more than Jacksonville — and 280.4 of that comes through the air. C.J. Stroud has thrown for 1,402 yards with six touchdowns and zero interceptions, and he just led a 26-3 demolition of Tennessee. The Texans are one-dimensional (79.0 rushing yards per game) but one-dimensionally dangerous. And the history runs the wrong way for Jacksonville: Houston has won seven of the last ten meetings, including a 36-29 decision in Week 10 of last season.

The Jaguars are a legitimate 4-1 team. But their margin has come from turnovers, defense, and special teams — three of the least stable inputs in football. Sunday at Wembley is the first real test of whether the formula holds when the offense has to carry a little more of the load, and when the men snapping the ball are not the men who were snapping it last week.