I don’t know what his buyout was and this is purely a guess, but I think CTA told him “This isn’t working out but we can’t afford to pay your buyout. Therefore if you want to jump ship, go ahead and we’ll let you leave because we don’t plan to resign you after next season.” There’s zero chance UNC/Warren paid to get out of his contract when they already have Gene Chizik. For Warren, this is a demotion and almost definitely a pay cut.
Warren inherited one of the best returning/accomplished defenses in the BigTen and completely sh*t the bed. Whether or not it was his fault, I can’t say but from my novice vantage point he made all the wrong moved in terms of schemes and situational adjustments.