First of all, OU's recruiting on defense cannot be compared to Alabama's and Clemson's recruiting, although OU's last three classes have been ranked starting in 2017, 7th, 8th and 5th nationally according to Rivals. And while there have been a good share of 3-star players taken, history shows that OU historically has had very good defenses with these players who were "coached up".
But a team that has to score 40-50 points or more....so often....in order to win has coaching issues that, IMO, trump lesser defensive talent issues.
I believe that OU would have had two national championships these past two years with just an average defense....the NFL draft and Alabama/Clemson be damned.
I'm extremely eager to see how Grinch's efforts can turn these players up to a higher level.