I think there was more than that. That defense, especially in the 2ndary, really really hurt after Mike Brown got hurt and wasn't 100%, and that really carried over into the playoffs.
I can't say with 100% that with Brown healthy the Bears would have won that game. But I do think that the coaching staff made a mistake in their coverage in the playoff game...it was a terrible idea to leave Smith alone 1 on 1 and focus on the other receivers, as was done in that game.
But it was a real, REALLY big shame that the Bears didn't go into that game with a healthy secondary, or at least with a qualified backup line out there. The Bears had 2 big holes last year, backup guy in the secondary and backup QB...both of which Angelo hit hard in the offseason. There may be other holes, but Angelo hit the 2 holes that cost the bears last-season in the off-season. And as a Bears fan 2nd and a sucky AFC team fan first...I have a feeling the Bears are in very, very good shape in 06