The Chiefs are the antithesis of their rivals in San Diego. Some may just see the 10-6 record, but look a bit deeper and you'll see signs of a serious let-down this year.
Of their ten victories, just one came against a team who finished with a winning record: their week one win against the Chargers. In that game, which the Chiefs won by a score of 21-14, the Chargers nearly doubled their yardage, outgaining KC 389 to 197. They won largely due to two long plays: a 56 yard scamper by Jamaal Charles and a 94 yard punt return by Dexter McCluster. They weren't so lucky next time they played San Diego: they lost 31-0.
They won't be able to feast on a weak schedule this season. They'll face the entire NFC North, none of which are bad teams. And thanks to their division victory last year, they'll get to face the Colts and the Steelers this year. Aside from their opening game against Buffalo and two games against Denver, every opponent should be a tough one (They actually lost at Denver last year).
KC brought in Steve Breaston and drafted Jon Baldwin in order to give Matt Cassel some receiving options, and that should help. Although Cassel's 93.0 quarterback rating looks good at first sight, his completion percentage was mediocre (58.2%, 26th in the league) and his YPA ranked 19th.
Cassel needs to improve along with his receiving corps, and Charles needs to perform at the same level as last season while shouldering a larger workload, otherwise the Chiefs will be no more than average on offense this year.
It seems like every year we see a surprise division winner or two from the previous season come back to the pack and miss the playoffs the next season. Last year it was the Bengals and the Cardinals, two years ago it was the Dolphins and Panthers, the list goes on and on. Look for the Chiefs to be one of those teams this year, all of the signs are there.