Also, have to mention the great victory by Purdue over Illinois. Very big for them. The Big 10 at this time have 7 teams clearly in the tournament.
No doubt there is some great basketball being played in the Big10 this year but
maybe on Jan27 the Big10 has 7, but by the end of the year only 6 will clearly be "in" the NCAAT-Indiana, tOSU, Iowa, Maryland, Mich and Nebraska. The currently slipping fast Illinois has 8 games left and are only favored in 3 including Sunday's game @ Rutgers which is essentially a toss up (66-63). A 19-10 Illinois and a >#51 rating will leave them on the outside.
What has to be considered for the field of 68 is the 32 Conference bids, meaning only 36 at large bids can be accepted and if any of the mid-Majors have an upset that gives away one of the 32, that lessens spots for teams like Illinois. The current cutoff point in Massey Rating would be any school with a rating of >46 is out.
Math is simple- There are 10 conferences whose top team fits easily in the top 50. That means 22 additional bids for Automatic qualifiers fall outside of the top 46. 68 total teams minus 32 AQs=36. 36 remaining bids plus the 10 AQ =46 top rating school will qualify. By Massey #46 is Missouri, who would be in, but #47 Columbia would be out.
Now the "Bracketology" uses combos of NET, RPI, playing trend, injuries and conjecture/subjective posturing by the committee which is ruled by the P5 so maybe Illinois gets in if they can maintain their #51 rating. But that is not "clearly".