I will reiterate my post from earlier, Diaco has run a base 4-3 the past 3 years at UConn. There is nothing other than conjecture that Diaco is going to transition to a 3-4, especially as a base defense at Nebraska. I personally expect Diaco's 2017 defense to look awful similar to Pelini's Big Ten defenses scheme wise, a 4-3 2 gap read and react scheme that rarely gets pressure and doesn't force many turnovers.
I hope I am proven wrong, but here's Diaco's defenses in takeaways and sacks
Takeaways
2009 (Cincinnati)- 79th
2010 (ND)- 36th
2011- 112th
2012- 48th
2013- 103rd
2014 (UConn)- 110th
2015- 24th
2016- 120th
Sacks
2009- 10th
2010 (ND)- 54th
2011- 59th
2012- 22nd
2013- 96th
2014 (UConn)- 121st
2015- 94th
2016- 111th
Here's Banker in comparison
Takeaways
2009- 105th
2010- 72nd
2011- 49th
2012- 14th
2013- 14th
2014- 86th
2015- 104th
2016- 67th
Sacks
2009- 105th
2010- 24th
2011- 54th
2012- 50th
2013- 66th
2014- 42nd
2015- 80th
2016- 68th
In the game I streamed online from last year they were most certainly running 3-4. Like most 3-4 units, they alternated between odd and even fronts about 50/50, but they were in 3-4 a lot regardless of what they called themselves on their depth chart.