Just curious, which seven teams are in this imaginary tie for fourth? I assume your top three are Wisconsin, Purdue and Maryland. Michigan is 7-6 and has only one game left against the top three. For them to finish 9-9, they have to either lose at Rutgers or else lose 2 of 3 to fellow 9-9 candidates. And if they lose to those in range for 9-9, then the teams they lose to are likely to wind up 10-8.
I know this is all fantasy, but even in a fantasy world I am having a hard time finding seven teams @ 9-9 at the same time. I think that is harder to imagine than is Illinois being one of them.
I'll play the game.
Eliminate anyone with more than 9 Ws or Ls (Purdue, Maryland, Wisconsin, tOSU, Rutgers). That leaves 9 with a possibility of 9-9.
Assume Northwestern loses out (ILL, IU, UM, Purdue) to finish 9-9 (1).
Illinois (NW, Neb, MSU, Rut) and Indiana (Iowa, NW, Purdue, tOSU) both win out to finish 9-9 (2, 3).
Nebraska loses to us, but wins the other three (MSU, Minn, UM) (4).
Iowa loses to IU, but somehow runs the other three (MD, WIS, PSU) to get it (5).
PSU loses to Iowa, but somehow runs the other three (Purdue, MINN, tOSU) to get it (6).
UM wins NW and Rutgers, but loses to Minn, Purdue and Neb to get it (7).
Minn goes bi-polar, winning MD and WIS while losing UM, Neb, and PSU (8).
MSU loses to Neb and ILL as discussed above, and then splits WIS/MD (9).
So 9 are still in play. The above is pretty "not going to happen", but you can see the path. I could see NW losing out and IU winning out. Nebraska's looks reasonable. Iowa isn't happening, but that would help PSU get there, which could help MINN too. UM and MSU's are feasible.