Aside from the obvious Nebraska differential, how have they fared against common opponents?
Here are the two columns from my table:

So, sequentially:
Vs Nebraska: IU was 45 points better.
Vs MSU: IU was 6 points better.
Vs NU: tOSU was 7 points better.
The Nebraska comparison is the one that obviously looks bad for Ohio State. I'll come back to that. The difference vs MSU is irrelevant to me. Both teams won by a LOT. If you want to get into specifics, I honestly think that tOSU's win over MSU was more impressive. I judge these things more based on time than final margin. What I mean is "at what point in the game was it effectively over?":
- Ohio State scored a TD just before halftime to take a 24-7 lead.
- IU didn't put MSU away until scoring a TD with 11:39 to go in the 3rd quarter to make it 30-10.
Indiana scored 26 second half points against MSU while Ohio State only scored 14. Part of the reason, I would argue, is that IU needed to, tOSU didn't. Ohio State went into halftime up 24-7 and scored two second half TD's to end up winning 38-7. Indiana went into halftime up 11 at 21-10, got a safety early in the third quarter to make it 23-10 (still a two-score game) and expanded their lead to 20 (three scores) later.
Not a big difference, but I think Ohio State effectively ended MSU's chances about six minutes sooner.
Ohio State's win over Northwestern was, IMHO, MUCH more impressive. Against the Wildcats:
Ohio State gave up an early TD then rattled off 31 unanswered points to win 31-7. The Buckeyes led by two scores (21-7) at the half and pushed it to three scores (28-7) early in the third quarter then kicked a FG late in the third to make it 31-7.
Indiana had a hard-fought back-and-forth game in which they led 17-10 at the half and 24-17 at the end of the third quarter. Northwestern pulled within three points midway through the fourth quarter (recall that tOSU led by 24 at that point in the game) and IU pulled away with two late TD's to win by 17.
I rate it as:
- vs Nebraska, IU was VASTLY more impressive.
- vs MSU, tOSU was somewhat more impressive.
- vs NU, tOSU was substantially more impressive.
Back to the Nebraska game, as promised:
The problem with reading too much into it is that Nebraska is CLEARLY IU's most and tOSU's least impressive performance so far this year.
Refer to the table above: Iowa is a MUCH better team than Nebraska, Ohio State beat them by 31. MSU and NU are comparable to Nebraska, Ohio State beat them by 31 and 24 respectively. The Buckeyes should have smashed the Cornhuskers and just . . . didn't.
Indiana beat MSU and NU by 37 and 17 respectively. Against teams definitively better than UNL, the Hoosiers beat UWash by 14 and Mich by 5. So they should have beaten UNL by something like 25 and they whipped them by damn near 50.
The problem is that if you judge a team by their best game, we are all National Champions. If you judge teams by their worst game well Bama lost to Vandy and Texas looked like crap against Georgia.
What makes me think that Ohio State will run away with this is that the one-and-only time that Indiana faced high-end talent they barely escaped the Wolverines at home and despite the fact that Michigan is a one-dimensional cluster that can't score.