How about comparing Shannon's 2010 defense to Goldens 2011 defense since they coached most of the same players over those two years.
Sure. Departing players from 2010 Brandon Harris, DVD, Ryan Hill, Allen Baily, Colin McCarthy, replaced by Chickillo, Futch, Gaines, Mike Williams, Finnie.
A quick look and it's safe to say that the departing players weren't replaced with better or more experienced players.
Stats.
PPG - 2010 (20.7) 2011 (20.1)
Rush Yard per per attempt 2010 (4.11) 2011 (4.11)
Pass Yard per per attempt 2010 (5.98) 2011 (7.54)
Total Yards per play 2010 (4.81) 2011 (5.48)
3rd down Conversion Opponents (34.85%) 2011 (41.1%)
Some surprises. Points per game favors 2011. Rushing yards per attempt is equal..
Pass defense was worse but it should be expected when you lose 3 starters 2 of which were drafted and replaced by guys like Lee Chambers, Mike Williams and true freshman in Finnie. Plus Ray Ray was suspended for 4 games.
add to this that 2010 defense the majority of players had a few seasons under their belt playing in this defense compared to 2011 which had no seasons playing in a different system plus the suspensions to guys like Ray Ray and Oliver for half the season and I don't think anyone that is objective can look at this and say that the 2010 defense performed relatively better than the 2011 defense.
And I'm not even going to mention the loss of guys like Forston and Buchannon early in the year.