While I do not disagree with your points, I think it is also worth pointing out that:
1) The Bears defense did a good job of throttling Seattle's mediocre offense.
2) Probably the most important part is that the Bears were able to run the ball and Cutler didn't throw an INT, which he is fairly prone to do. He was 15/28 which is decent, but not lights-out by any means. When a team like the Bears can run the ball, win TOP and let the defense do their job, the odds are good. On top of that, Cutler playing error free pretty much seals the deal.