I also remember that Denver struggled against Houston, and that was long after Houston's season had melted down.
Edit PS: Actually the game to see how Denver might match up would be the Jacksonville game. Bradley has borrowed almost all of Seattle's defensive schemes and philosophy (and much of Seattle's philosophy in general....almost to the point where I am starting to think of Jax as "Seahawks East").
Now the game's outcome was never in doubt because Jacksonville had frankly some of the worst talent in the NFL (sorry Jax fans but it's true). Nevertheless, for the first time in the season, Jacksonville made Denver's vaunted offense struggle and they made it struggle for exactly the same reasons why we think Seattle's defense is such a bad matchup for Denver. Heck it was a game all the way into the fourth qtr. Given the disparity of talent between Jax and Den (or between Jax and Sea), that's a disturbing portent if you are a Bronco fan.