Not sure tressel is the answer for a DC.
He made be okay if he had better talent than the other guys but that's not going to happen too often at Wisconsin.
One thing our run of defensive coordinators had was they were good at generating overload pressure from one side or the other and tressel is pretty much a straight up coming right at you pass rush scheme.
That's fine if you have four guys up front that can consistently beat the o-line across from them but that's not going to happen here.