I think having Willy as starting pivot was an o-line killer. Sure we traded out Neufeld for Bond on the line, and boy what a difference that has made, but I think a lot of the sudden statistical improvement is on Nichols not feeling "pressure" just from seeing a blitz coming as well as being able to throw a ball knowing he is going to get hit rather than turtle which has brought down the sack totals. He is also more mobile and has a quicker release (although I don't think there is another QB in the league that could not claim the same) and just seems to have better field vision in general.