How were 2011 and 2012 not elite? If you watched the games you saw them bail out a terrible offense time after time and force a ridiculous number of turnovers and punts.
No offense but you sound like some of the kids here that only started watching the Bears during the 06 Superbowl run.
2011: Allowed 341 points (21.3/g), 14th.
2012: Allowed 277 points (17.3/g), 3rd.
Good but not elite.
To put that in perspective let's look at arguably the 2 best defenses of all time.
The 1985 Bears D allowed 198 points (12.4/g), 1st.
The 2000 Ravens D allowed 165 points (10.3/g), 1st.
The 2005 Bears D allowed 202 points (12.6/g), 1st. Right in line with the best D's of all time. Hence: ELITE.
Sorry but if you actually watched the 2005 defense there is no comparison. Urlacher, Briggs, Tillman, Mike Brown all in their prime and healthy. Tommie Harris young and healthy and beasting like he's Warren Sapp. That defense rallied to the ball, gang tackled, and PUNISHED people like the 85 D.
The 2012 D was older, slower, and reliant on turnovers to make up for it (Tillman had 10 forced fumbles that year himself!!).. If they didn't force a fumble or get an INT they were very susceptible to get carved up in the air without a playmaker like Mike Brown in the secondary who was always around the ball and in the right spot at the right time.
Sorry but there's no comparison really to anyone who actually watched the 2 defenses play. The 2012 D was good but the 05 D played at an elite level.