IMO the loss of Tollefson to FA has been one of the biggest reasons for the lack of a Pass Rush this season. Yea he only had 5 sacks, 13 tackles 8 assists a forced fumble and 1 defended pass last season but many of these plays were clutch as he would play inside and outside giving every player on the DL a breather . He had quickness rushing the passer and was ALWAYS around the ball as the stats show . How many times did he force the QB to throw it away ? Sometimes you can't measure how much a good back-up player means to the system .
This season the DL doesn't get those fresh legs and non-stop motor coming off the bench and his loss is the difference in what we see from 2012 to the present .