He backtracked on all that once he realized that everyone hated him and his life was going nowhere but in the dumpster.
I've always thought he didn't have any dirt anyway.
When you look at the literally thousands of football players who pretty much say publicly that they'd jump on a grenade for KF it says something. I don't always agree with his coaching style (although I agree with it more now than years ago), but there's no denying that Ferentz is a positive role model in a lot of kids' lives and lots of them had their futures totally transformed by playing on his football teams.
I think the thing is with Ferentz that you get the absolute 100% benefit of the doubt when you come on board (which is important to wet-behind-the-ears college kids), and you'll get a second chance if you screw up, but if you cross him or his staff you might as well be Fredo. You're dead to the program and DJK couldn't come to terms with that.