Which still makes me wonder if, even attempting to control for opponents, so many bad offenses in the B1G is still skewing the numbers.
I'm not trying to talk down the defense. I think they have been superb. But it just makes me wonder if there is a bit of a bubble that might pop.
Interesting. Here are the FPI rankings of B1G offenses and power 5 opponents outside the conference with score and defensive FPI:
Michigan: #2 no power five opponents
Ohio State: #10 17 points vs Notre Dame (#14)
Penn State: #27 38 points vs West Virginia (#55)
Maryland: #35 42 points vs Virginia (#59)
Purdue: #59 24 points vs Virginia Tech (#69)
Purdue: #59 20 points vs Syracuse (#33)
Illinois: #67 23 points vs Kansas (#56)
Minnesota: #70 13 points vs North Carolina (#76)
Indiana: #74 14 points vs Louisville (#20)
Rutgers: #79 35 points vs Virginia Tech (#69)
Northwestern: #82 14 points vs Duke (#25)
Wisconsin: #86 22 points vs Washington State (#58)
Michigan State: #107 7 points vs Washington (#42)
Nebraska: #116 14 points vs Colorado (#103)
Iowa: #126 13 points vs Iowa State (#32)
Overall I think Nebraska, Iowa, and Michigan State have pumped the overall defensive stats of the B1G, but I also don't think it is full on bubble territory. Honestly, Rutgers offense being on the lower side is probably more indicative of the B1G East keeping offenses a little lower than they might otherwise be capable of reaching.