In Venables last year at Oklahoma his defense gave up 41 to Texas Tech, 45 to Baylor, and 44 to Oklahoma State. They were were the 22nd, 4th, and 2nd ranked offenses respectively.
In 2019, which is the season where fans say its obvious that Brown was in decline, Brown's D gave up 14 to ND, 56 to OSU, and 35 to Bama, which were the 13th, 3rd, and 2nd ranked offenses. This is in the spread era where sneezing on offensive player draws a flag. Those are better numbers than Venables last season at Oklahoma.
I am just waiting for Miami fans to say that Venables was a garbage hire. Fortunately for Clemson, Dabo is smarter than most Miami fans and he saw that a DC with almost a decade worth of success at a P5, but whose defense had declined, was worth the risk. Brown turned around the defenses at two P5s and then had one of the top defenses in CFB in 3 of his 5 years at Michigan.
If I'm in Manny Diaz's shoes and I'm looking at a 2 year window that could spell the end of my coaching career if I don't have success, I'd rather put my fate in the hands of a proven, established P5 DC whose stock is down than a hotshot G5 DC whose school did not play a single P5 program. Once I get some breathing room with some back to back 10 win seasons, I can go for the high-risk high reward G5 young buck from the Mountain-**** Conference.