It did throw off Brady. The Bears actually threw off the Patriots offense in a pretty significant way, they didn't away with some of the shit they usually get away with.
Two of the TD's came off Bears special teams blunders. Classic Belichick, he found the weak spot of the Bears and pounded it. He's just incredible, no other team except the Patriots wins that game. That's not an excuse for Nagy, the fact that the Bears special teams are that bad is alarming and is one of the clearest signs that he may not be an NFL quality head coach. Seriously, of all the sky-is-falling rhetoric coming out this week that should be #1. The Bears have a talented, athletic bottom-third of the roster...why the hell are the special teams terrible? Its inexcusable.
But the defense was actually OK. Not great, it'll never be great when Mack isn't himself, but effective. Fangio's coverages are awesome. The guy knows what he's doing and exactly how to mix man and zone. The Bears rush though simply sucks without Mack. They aren't talented. Hicks and Goldman are good but they cant bring the heat themselves. Lynch can only succeed in the shadow of Mack and Floyd cant rush period. RRH and Nichols are literally their best chances at penetration when Mack is hobbled like this.
So to see Fangio using these guys the way he does with all these crazy fronts and coverages to even slow down an offense like Tommy TD's...I was a little impressed. Still overall pissed about the loss and worried as hell that Mack's injury isn't going to get better any time soon, but I am not panicking about the defense the way many people are.