Interesting thread!
It's a few days old now, but Oklahoma hired Buckeye Co-DC Alex Grinch as DC.
Sooner fans are mostly very impressed, although there have been grumblings that the Buckeye defense in '18 wasn't stellar. The response to that from the cheering section has been that Schiano ran the defense.
A lot of Sooner fans believe that if we had had even a mediocre defense the last two years we'd have won national championships #8 and 9. Two once-in-a-generation QBs in a row, and what we have to show for it is four conference championships and three semifinal losses in the CFP. Four consecutive conference championships is no small thing, but with offenses led by Baker Mayfield and Kyler Murray, there seemed to be potential for much more than that.
I think Grinch will do fine. The defensive talent isn't Bama- or Clemson-esque, but it's good enough to be near the top in the Big 12, instead of #8, 9, or 10 in just about every category. And recruiting is getting better. If Grinch is as good at OU as he was at Wazou, he'll do fine and so will we.