IIRC, three starters on Nebraska's last NC team were not just partial, but non-qualifiers. The Big Eight, like the Big Ten, had no restrictions, but two schools -- ISU and either Mizzou or CU -- didn't take partials. The SWC didn't allow any, which the SWC schools wanted to be the case when four of them joined the Big Eight to form the Big 12. Nebraska went ape shit. I think that as a sop to the Huskers, the new league allowed one PQ in each sport each year, something like that. But basically they haven't' been permitted since the Big 12 was created.
NOTE: I do not know whether Iowa takes them or not. I know they took at least one for MBB. The point I (and I think Bear) are making here is that the lack of restrictions was one of the reasons NU jumped leagues.