Even if you want to ignore 2012, I would submit that finishing #23 - #24 - #27 in scoring defense in his other 3 years was certainly better than the two years prior his arrival - #42 and #63, and the 3 years since he has been gone - #85 - #41 - #62.
So yes, I think that Diaco was a very good defensive coordinator while at Notre Dame, and will do a great job at Nebraska.
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