The OSU/Minn games doesn't have an immediate effect on the West unless there is a tie and Iowa, Nebraska and Wisconsin have the same division record at the end of the season. Iowa has to win out to take the west and either Nebraska or Wisconsin has to beat Minnesota. If Iowa wins out and Minnesota does too, they play in the B1G Championship game. Correct me if I am wrong.
Taken from B1G site:
The following procedure will determine the representative from each division in the event of a tie:
(a) If two teams are tied, the winner of the game between the two tied teams shall be the representative.
(b) If three or more teams are tied, steps 1 through 7 will be followed until a determination is made. If only two teams remain tied after any step, the winner of the game between the two tied teams shall be the representative.
1. The records of the three tied teams will be compared against each other.
2. The records of the three tied teams will be compared within their division.
3. The records of the three teams will be compared against the next highest placed teams in their division in order of finish (4, 5, and 6).
4. The records of the three teams will be compared against all common conference opponents.
5. The highest ranked team in the first College Football Playoff poll following the completion of Big Ten regular season conference play shall be the representative in the Big Ten Championship Game, unless the two highest ranked tied teams are ranked within one spot of each other in the College Football Playoff poll. In this case, the head-to-head results of the top two ranked tied teams shall determine the representative in the Big Ten Championship Game.
6. The team with the best overall winning percentage [excluding exempted games] shall be the representative.
7. The representative will be chosen by random draw.