I have done some research, and it seems that the one quarterback stat that has a correlation with wins is number of sacks.
That is, the fewer the sacks, the more likely your team is to win the football game.
For example, today Rex Grossman had zero sacks, compared to Drew Brees's 3 sacks.
Of 16 quarterbacks that played the VAST majority of downs for their teams, the "correlation coefficient" of sacks compared to the number of wins was -0.795. That is EXTREMELY high and significant - those of you with a background in statistics would agree.
Of the 16 quarterbacks the one MOST LIKELY to be sacked was the Falcon's Michael Vick - by far the worst of the worse in playing the NFL quarterback position.
ANYWAY, my point is: Rex Grossman, and his offensive line, has as much to do with the Bear's winning season as their good defense. Don't believe that a quarterback has to throw for 300 or even 200 yards to win games - they don't, all they have to do is not take sacks and don't throw interceptions. Lovie Smith is a smart guy for sticking with Grossman this season, the guy knows what he's doing - ask him if he'd rather have Grossman or Michael Vick, I would guarantee you he would rather have mistake-free Grossman over the supposedly "athletic" Michael Vick.