Why was that expected? What about last year made you think the D would suck this year? That's why it's such a head scratcher. The playoff game against Wash was vintage D at it's best--they allowed 120 yds! What has happened since then? I think it has to be related to Marinelli & Tomlin leaving, but even that is puzzling.
Rod & Tomlinson. Did you NOT expect a dropoff this year? Granted It's much worse than many of us expected but a dropoff was coming, you don't lose Rod and not have an effect.
EDIT: Rod was a huge, huge, part of this D. Myself, I expected a little bit of a dropoff, then back to form after a few weeks, and am rather shocked by how far we fell, but in hindsight it's not that shocking.