Guys--I don't believe we're looking at this right. Look at the tie breaker rule again:
2. In the event these two teams divide a series between themselves, the team with the best winning percentage against all teams ending the season (tied or not) in positions 1-2-3-4-5-6 in the final conference standings will receive the higher seeding spot.
So look at the series again:
Indiana
2-1 vs. Michigan
3-0 vs. Ohio State ? (Tied for 6th)
3-0 vs. Iowa ? (Tied for 6th)
3-0 vs. Michigan State (Not Top 6)
2-1 vs. Illinois
3-0 vs. Purdue (Not Top 6)
3-0 vs. Penn State (Not Top 6)
0-1 vs. Minnesota
4-3 .5714285714285714 (Not including tOSU or Iowa)
7-3 .70000 (If Iowa gets 6th)
7-3 .70000 (If Iowa gets 6th)
Nebraska
1-2 vs. Iowa ? (Tied for 6th)
3-0 vs. Ohio State ? (Tied for 6th)
3-0 vs. Minnesota
1-2 vs. Northwestern (Not Top 6)
2-1 vs. Michigan
3-0 vs. Penn State (Not Top 6)
3-0 vs. Michigan State (Not Top 6)
1-0 vs. Illinois
6-1 .8571428571428571 (Not including tOSU or Iowa)
7-3 .70000 (Iowa gets 6th)
9-1 .90000 (tOSU gets 6th)
If tOSU gets 6th, then we win the tiebreaker and the #1 seed. So go tOSU...?
If Iowa gets 6th place, then both IU and DoNU are tied, so we go to the next step in the tiebreaker, which is looking at common opponents, as you did above already.
Common Opponents:
Indiana
2-1 vs. Michigan
3-0 vs. Ohio State
3-0 vs. Iowa
3-0 vs. Michigan State
2-1 vs. Illinois
3-0 vs. Purdue
3-0 vs. Penn State
0-1 vs. Minnesota
Percentage = 16/21 = 76.1904762%
Nebraska
1-2 vs. Iowa
3-0 vs. Ohio State
3-0 vs. Minnesota
1-2 vs. Northwestern
2-1 vs. Michigan
3-0 vs. Penn State
3-0 vs. Michigan State
1-0 vs. Illinois
Percentage = 16/21 = 76.1904762%
So, we'd go to Step 4:
If the teams are still tied, seeding will be determined by the team that allowed the fewest number of runs in conference games. If the two teams have not played all 24 conference games or an equal number of games, then to use this procedure, it is necessary to move back to a point in the season where the two teams played an equal number of games (i.e., 23, 22, 21, etc.).
And that has yet to be determined until IU and DoNU play through their series.
But, as added above, this is all rendered moot if DoNU drops a game to Illinois or IU wins one game.