He's not the reason we lost yesterday, but you're right, don't think I've ever heard him say anything along the lines of letting his team down.
I will agree the players should hold most of the blame for yesterday, but you could just tell from his press conferences since the Giants game the kind of mood that was present at practice and preparation for the Cardinals' game. Sort of like a we have arrived, we are so good just watch type feel.
Oh, and not to mention the playcalling yesterday...the 2nd half was horrific. Arizona made adjustments as soon as we almost scored after the first drive. SMH. He has to go.