If it comes down to a 3 or 4 way tie, and the head-to-head stuff can't be sorted out, does it come down to overall record, then? That's where I see OSU has the edge, at 22-8.
But, I think Iowa will beat NW and OSU will lose @Wisky, so it hopefully won't be an issue anyway.
Oh well, maybe it's easier just to see who wins and go with the flow.
If record against opponents you are tied with doesn't sort it out, then they start with record against the best team in conference and work their way down. In a 3 way tie with Purdue, OSU, and Iowa, our record against them is 2-1, Purdue's is also 2-1, OSU is 1-2. OSU gets eliminated and they compare iowa and Purdue's record against Wisconsin. We both lost so they move down to Maryland. We beat them so we win the tiebreaker.