The Chiefs would've been there had they beaten either lowly Philly or even more lowly Buffalo, but they didn't.
How about the Chargers? Beat Indy, the Pats, Giants, and Redskins (all playoff teams) but lost to Miami and Philly and are home for the playoffs. Marty, Marty, Marty - how could you misuse all that talent?
Thats what makes the NFL so great, the unexpected. Good luck against the Bengals,