My guess is Nicolds and Topalovic redshirt -- if everybody else stays healthy, eligible and ready to go. Both are rather raw and would benefit from a redshirt year, and both play positions where ISU already has at least two experienced players ready to go. I know Bill would have liked to have redshirted Scott Tyler and Justin Smith last year, but was forced to play them because of the eligibility issues with Wilson, Bradley and Slavik.
And, Knight, we are told, is working on getting eligible, so he's definitely redshirting next season.