Jeremy Pruitt is unquestionably a great defensive coach. He's also a huge risk.
His best years were at Alabama under Nick Saban.
Outside of that he's nuked, not just burned, bridges in Tallahassee, Athens and Knoxville. In fairness, Phil Fulmer threw his own ICBMs into the fight. But Pruitt gave as good as he got on that front.
IOW, Nick Saban has been the only head coach who could keep him remotely close to in line. Problem there is Saban now lives in Florida, is a talking head, and has had his fill of trying to keep a lid on out-of-control coaches, players and hangers-on. He's not around to keep Pruitt from driving off a cliff.
At a different level, hiring Jeremy Pruitt as your DC it's kind of like hiring Rush Propst as your high school's coach. He's a great coach. You'll get vastly improved performance. At what cost? You go in knowing that it's a matter of when, not if, he does something to embarrass you.
And anyway, while defense under Wommack hasn't been perfect, it's not the reason we haven't done better against good to teams.
In short, the benefit Pruitt would generate isn't worth the baggage he brings.
Acknowledging that he's a great defensive mind and motivator, I don't want him.