A little more on odd records:

What I have done here is ranked all 14 B1G teams by their winning percentage against the top half of the teams in the league (those .500 and better, M, IL, IA, PU, tOSU, UW, RU) in the "Rk vs .500" column and then ranked them all again based on their winning percentage against the bottom half of the league (those under .500, UMD, MSU, IU, PSU, NU, MN, UNL) in the "Rk vs >.500" (should be <.500) column. Note that ties are scored as the average of the rank that the teams are tied for:
- MN and MSU are tied for 7/8 against the .500+ so both got 7.5
- IU and PSU are tied for 10/11 against the .500+ so both got 10.5
- IL and PU are tied for 1/2 against the <.500 so both got 1.5
- MSU, IU, and PSU are tied for 9/10/11 against the <.500 so all three got 10
Finally, the "Difference" column is the difference between the two rankings.
Unsurprisingly, most teams that are relatively very good against the top half are also relatively good against the bottom half. For example, Illinois is tied for 1/2 against the bottom half and second against the top half. Similarly, most teams that are relatively bad against the top half are also relatively bad against the bottom half. For example, Nebraska is 14th against the bottom half and 12th against the top half.
Half of our teams (MSU through PSU above) fall within 2.5 ranking places against the top and bottom halves of the conference. Another three (PU, M, tOSU) fall within 3-3.5 ranking places against the top and bottom halves and that is still reasonably close. The odd ones are the top four on the list above:
Wisconsin, 13th against the top half, 3rd against the bottom half:
As presented upthread, the Badgers were extremely good against the bottom half of the league, trailing only IL and PU but extremely bad against the top half of the league, better than only Northwestern.
Northwestern, 14th against the top half, 6th against the bottom half:
The Wildcats were surprisingly good against their peers in the bottom half of the league but flat awful against the top half. Northwestern was actually 5-2 (.714) against the bottom half of the league, they were:
- 1-0 against Maryland (home)
- 1-0 against Michigan State (home)
- 1-1 against Indiana
- 0-1 against Penn State (away)
- 1-0 against Minnesota (away)
- 1-0 against Nebraska (home)
That is a very good record even against those teams. In the rankings it falls right between Iowa (8-3 or .727) and Ohio State (7-3 or .700). Iowa and Ohio State are tournament locks while Northwestern's only chance is to win the BTT. That is because while Northwestern was just as good against the bottom half as Iowa and Ohio State, the Wildcats were dreadful against the top half. They split with the Buckeyes but went 0-10 against the rest of the teams that finished 10-10 or better.
Maryland, 6th against the top half, 12th against the bottom half:
The Terps were reasonably good against the top half of the league, going 4-7 or .364. That is just behind Purdue (3-4 or .429) and just ahead of Minnesota and Michigan State (both 4-8 or .333). Their problem was that they didn't back that up by taking care of the teams that they should have beaten. They were only 5-4 or .556 against the bottom half of the league. That is just behind MSU, IU, and PSU (all 5-3 or .625) and ahead of Minnesota (2-6 or .250).
Minnesota, tied with MSU for 7/8 against the top half, 13th against the bottom half:
As presented upthread, the Gophers were respectable against the top half of the league. Their record of 4-8 or .333 was tied with Michigan State just behind Maryland (4-7 or .364) and just ahead of Rutgers (2-6 or .250). Michigan State, Maryland, and Rutgers are all at least bubble teams while Minnesota's only chance at the NCAA would be to win the BTT. Their problem was that they were flat awful against their peers in the bottom half of the conference. Their record against the top half was actually better than their record against the bottom half (2-6 or .250). Thus, a team with great quality wins over Michigan, Iowa, Purdue, and Ohio State will miss the tournament. It is because they also have losses to Nebraska, Northwestern, Penn State, and Indiana.