Foster wasn't doing great against the Bears defense in that game, he had about 3.4 ypc by the time he went out. Our success against Chicago was mostly due to their secondary not being able to shut out Smith.
But everybody seems to attribute our playoff run solely to Foster. Having him against Seattle wouldn't have been nearly enough to play competitively.
the reason why foster going down was huge was because he was a legit at the time starting #1 RB on the team making the opposing defense at least have to gameplan for him, we lost him and then on the first series lost Goings, the Panthers lost their ability to use their play action pass which our entire offense scheme was predicated on, basically meaning without a running game we didn't have a offense.
that's why it was huge when Foster went down, and no he might not of been the sole reason for the playoff run, but he played a bigger role in the offense then a lot of joe shmo fans would realize.
I've always hated the fact that we succumbed to injuries in the playoff run, I seriously believe to this day had we been healthy we would have won the Super Bowl that year. Because our defense was just as good as the steelers and our offense was better imo. but we just got bad luck and sometimes that happens.