Also, once you get past the FCS designation, South Dakota State is probably better than most Week 1 opponents the Big Ten is facing.
Sagarin, who combines FBS and FCS into one ranking, had them #58 to finish last year. Some teams around them? Starting at #56 it went Maryland, Vandy, South Dakota State, Cal, Wake Forest, Temple, Baylor, BYU, VT, Arizona, Indiana, Florida State. We wouldn't be poo pooing a close win against any of those teams, and IIRC, both Temple and BYU, teams worse than South Dakota State, scored wins over Big Ten schools last year