If you look at the conference standings and overall records, I think it questionable the B1G gets more than 6 teams in the Big Dance this year. I don't think it is probable from the sample size we have seen thus far, but the only two teams that could even potentially make a second half conference run is either Ohio State or Wisconsin.
Here are the standings:
http://www.bigten.org/library/stats/mbb-confsked.html
Here are the standings:
http://www.bigten.org/library/stats/mbb-confsked.html