This is one thing I'll disagree with you on. The defense absolutely could have been better. Not that anyone is primarily blaming them for the loss, but 16 points against a backup QB with a poor OL is not a "more than good enough" performance. The Chiefs defense this weekend held the vaunted Jags offense to just 3 FGs, 0 TDs, in a game where the Chiefs offense and special teams put the defense in some bad situations.
I guess I just don't agree with this idea that if the defense lets up less than 20 points they are automatically excused from any and all blame. Wouldn't it be nice if when Allen had a bad day, some other part of the team found a way to overcome it? I can't remember the last time that happened.