Just after the bye week, I did an article showing that the Colts offensive line had improved over last season. If you didn't read it, or don't remember it, I strongly suggest you do so now, before reading this piece. I'll refer heavily to it and to certain ways to measure the play of offensive linemen. I'm not going to go back and explain all the stats here. If you want to know what a certain stat measures or how it is calculated, please refer to the original piece.
Since then, the line has been terrible, culminating in a dismal performance Sunday night against the Chargers. Manning got hit frequently and had no time to go downfield, and the run game just isn't working.
The question is: why?
There are several theories, but first let's see if the numbers support the claim.