Diaz has done it without zone blitzing. Diaz defense is gimmicky. A lot of stunts, blitzing, and etc. When it doesn't work his defense doesn't look as good. On top of that the secondary dropped off from 2018.
Diaz absolutely dropped joe jack into coverage a few times. One time i remember for sure was in the unc game in 2018. And i remember him dropping d.jack in coverage before too.
Yall dudes keep talking about baker when this is diaz defense. He hired baker for a reason. He isn't changing his scheme so no dc will be hired. On top of that he will use the defense finishing 13th as a reason baker shouldn't be fired.