Manny Diaz has a prior head coaching stint in his past at Miami, but otherwise, the new Duke leader has largely been a defensive coordinator, with his expertise centering on that side of the football. So, when Diaz was brought on at Duke, the No. 1 question for fans became: what will this new defense look like? For a guy who spent 13 straight years as a DC before accepting the Miami gig, Diaz certainly has developed a philosophy on defense. At ACC Media Days, he revealed his No. 1 goal on defense. “Well, the identity of this defense has traveled from Penn State through Miami, Mississippi State…