I agree Chan Gailey was exposed. I will have to disagree that the idea that getting by with an average QB and building your defense was exposed. In fact, the 49ers had a fantastic defense and top tier running game while their passing game didn't fare as well. These numbers fairly blatantly point out that there needs to be better play from the passing offense/QB or the Defense and that while Fitz didn't do as well as the Qbs in the Super Bowl and Wilson, he wasn't out of their ballpark.
I reiterate, there has to be better play from the QB or Defense. I disagree in your assertion that going the route of upgrading the defense first was the wrong decision. Of course, if you see that Ravens/49ers as having gone the route of upgrading the QB first before their defense, I'd appreciate you pointing that out to me. I am not incredibly well versed on their histories.