Looks like I may have miscalculated the denominator. So here's all the possibilities (at 3-2 or better):
Nebraska goes 5-0:
OSU or Illinois goes 1-4
Iowa goes 3-2 (not sure on tiebreaker, we went 1-1 in the series, but they have a better overall record)
Indiana or MSU goes 3-2
Nebraska goes 4-1:
Tiebreakers if OSU goes 0-5, Illinois 0-5, or Iowa 2-3 (Rutgers doesn't go 5-0)
Indiana or MSU goes 2-3
Nebraska goes 3-2:
Indiana or MSU goes 1-4 (Maryland or Rutgers doesn't go 5-0)
Can you verify, @The Polish Rifle?