In the second half, Illinois scored 1.57 points per possession, NW scored 0.38.
As for overall per possession stats through today:
The top 4 in the conference have been so dominant thus far, only 5 of 14 teams have been a net positive in conference play. Ohio State mostly because they haven't played any of the top 4. In fact, none of the top 5 have played each other yet (Minnesota has, unfortunately, met the blunt end of games against Illinois, Wisconsin and Michigan already).
EDIT: In fact, Minnesota's schedule has been brutal so far, with wins against Iowa, Ohio State and Michigan State and blowout losses to Michigan, Illinois and Wisconsin, with their next two games being at Iowa and home vs Michigan. So, I expect them to shoot up this list starting...in two weeks maybe.