Left it open? Didn't Blake Williams take over, along with Chuck Cecil and Dave McGinnis?
It's funny, I actually looked up stats (something I rarely do now) to see how they ranked.
2012 - 14th in points, 114th in total yards
2013 - 13th in points, 15th in total yards
If that's "sucking", well bah gawd I can't wait to see what Wade Phillips can do.
Also, Tim Walton was never fired in the season. He was basically a 1 year rental coach. Besides, it was said that he had a lesser role in the defense, hence the rankings improving towards the end of the season.