SD has had a number of long KO returns, including 2 returned for TDs in the same game, as well as blocked punts returned for TDs and the like. Things like this go on the scoreboard, but take away yardage allowed from the D and give the ball back to the offense for another possession. I'm not saying they would be bottom third with better special teams, but their top billing team yardage-wise does come into question.
On that note, here are some more broken down stats.
* SD is 13th in the league in defensive 3rd down %, at 37.5% allowed. Their opponents have the following offensive 3rd down percentages.
39.8% - StL
42.6% - Seattle
34.1% - Oak
34.8% - KC
29.5% - Zona
39.5% - Jax
Only Seattle is in the top half at #8. StL and Jax are next at 16th and 17th. So, the team that is supposed to be the #1 defense in the league is middle of the road at allowing converted 3rd downs despite facing a lousy set of offenses.
* SD is 18th at offensive 3rd down conversion rate at 39.4%. Again, here is the opposition on defense:
33.8% - StL
36.4% - Seattle
41.3% - Oak
34.7% - KC
45.2% - Zona
45.5% - Jax
This is a bit less damning since SD has faced three defenses in the top 10, but it isn't nearly as impressive as their yardage ranking. The average is better than three and worse than three and right about at the mean. Not exactly where you would expect a top offense to end up.
Let's also look at passer rating, which I don't exactly like but it is illuminating.
* SD's defensive passer rating is an impressive 67.8, good for 2nd in the league. The bad news for them is the offensiving rating of teams they have faced.
69.3 - StL
75.5 - Seattle
66.4 - Oak
84.5 - KC
59.0 - Zona
77.6 - Jax
SD's rating isn't too far off from the 72.1 mean of that pathetic group. When the best passing team you've faced is quarterbacked by Matt Cassel, you should be a top 5 team according to defensive passer rating.
* Now, the one thing that is a genuine concern is SD's offensive passer rating of 100.8.
79.5 - StL
79.3 - Seattle
98.5 - Oak
84.3 - KC
82.2 - Zona
110 - Jax
Only two of the teams allow opposing QBs to pass for near what Rivers is, and he is nearly 12 points over the mean of 89.0, despite facing one of those defenses in the middle of a monsoon. Both times Rivers faced a passing defense in line with NE's (96.5 - getting better :rocker
he tore them up.
* Looking at yards per attempt. SD's rushing ypc is 4.3 for 12th in the league. Here are the defenses
4.4 - StL
2.9 - Seattle
5.0 - Oak
3.7 - KC
4.3 - Zona
4.3 - Jax
Similar to most of the others, you have a performance that is about at the mean of the defenses faced. This is pretty fair considering no one believes that SD's rushing game is their biggest threat.
* SD's rushing ypc allowed is 3.7, good for 6th in the league.
3.6 - StL
3.6 - Seattle
4.2 - Oak
4.9 - KC
4.5 - Zona
4.3 - Jax
Looking at the offenses actually makes SD's defense even more impressive. Their ypc is about even with the two worst offenses they've faced and more than a half yard better than every other opponent. The problem for SD is that NE is the first team they will be facing that doesn't run to set up the pass.
* Passing ypa basically illustrates what we already know. SD is tops in the league by a healthy margin at 9.1, almost 2 full yards higher than the mean defense faced.
6.8 - StL
7.4 - Seattle
7.3 - Oak
6.9 - KC
7.0 - Zona
8.8 - Jax
Only Jax is even close. Every other defense was shreaded big time. Not a good sign for a Patriots team that is already allowing 7.6 ypa, the 2nd worst pass defense SD will have faced on the young season.
* SD is also impressively ranked at passing ypa at #4 with 6.1. Again, this will look less noteworthy when more closely inspected.
5.9 - StL
6.5 - Seattle
6.3 - Oak
6.3 - KC
5.8 - Zona
6.4 - Jax
Not a single offense faced is in the top 20! Wow.
The more I look at things, the more it looks like SD's passing defense is average at best and will be cut up by NE this week.
On the whole, I'm having a really hard time seeing them score less than 24 points considering the matchup between SD's passing and NE's pass defense. This isn't a team like Baltimore that leans on the run when the going gets tough. That said, NE appears to have a sizable advantage over their defense and special teams so a 31-27 victory isn't out of the question.