Off the bat I would blame Zaxor for bringing this up again.
On a serious note I think you have to go from top to bottom.
I just can't see how you could only blame one without others.
Sure other teams have injuries....but at the same time they DO play a part in your team's performance at times.
Sure you can blame assistant coaches...we have went through some over the years.
Sure you can blame the head coach...he has admitted blame himself.
Sure you can blame the players...drop passes, missed tackles, bad throws, penalties and so on.
Sure you can blame the owner...if we would have been preparing for the eventual departure of our star QB (whether left because of injury or not), if we would not try to hit a home run with a toothpick instead of a louisville slugger and other reasons.