Entering Week 7 of the 2010 NFL season, power rankings of the league's 32 teams are as volatile as they've ever been this late in the year.
No one's undefeated, only the Buffalo Bills and Carolina Panthers are winless, and 11 teams are either .500 or one game away. Preseason favorites like the Dallas Cowboys and Minnesota Vikings have flopped while 2009 bottom-feeders such as the Kansas City Chiefs and Seattle Seahawks have started hot.
The bottom line? We don't know if they are who we think they are, let alone who we thought they were.
With quarterbacks, thankfully, it's a different ballgame. No matter how many interceptions Tony Romo threw (two) in Dallas' Week 6 loss at Minnesota, there's no way the Cowboys would trade him straight-up for San Francisco's Alex Smith.
Despite such tiers of talent, the master list of NFL passers still features plenty of week-to-week jostling for position. As of this next-to-last week in October, here's how they're ranked.