Except the rules have changed now:
From
https://en.wikipedia.org/wiki/Bids_to_college_bowl_games#Big_Ten_Conference:
And from
https://en.wikipedia.org/wiki/Rose_Bowl_Game#College_Football_Playoff
What this all means is:
1. The Big Ten champion goes to the Rose bowl automatically when it is not a playoff semi-final. So if OSU wins the conference over us, but does not make the playoffs, they go to the rose bowl. Only way I see this happening is if they drop a game before the conference championship. If they are undefeated and then beat us, they are in the CFP as an undefeated P5 no if, ands, or buts.
2. In the case OSU is in the playoffs, the bowls then submit their preferences and then the Big Ten sets the bowl games. What this has effectively meant is the "Second best" Big Ten team goes to the Rose bowl, since the Big Ten wants to have the best chance at winning that bowl game. In all the years of CFP when the Rose bowl was not a semi final, and the Big Ten Champion was in the playoffs, this has gone to the second highest Big Ten team in the CFP rankings:
- 2015 Rose Bowl was a playoff game, not Big Ten Team.
- 2016 Rose Bowl: #6 Iowa (Big Ten West Division Champ and Second Highest rated Big Ten Team behind #3 MSU in the playoffs)
- 2017 Rose Bowl: #5 Penn State (Big Ten Champs, but also Second Highest rated Big Ten Team behind #3OSU in the playoffs)
- 2018 Rose Bowl was a playoff game, not Big Ten Team.
- 2019 Rose Bowl: #6 OSU (Big Ten Champs, highest ranked Big Ten team)
What this all means is, if we win the west division, but lose the Big Ten championship we have a pretty good chance at the rose bowl as long as we are the 2nd highest ranked big ten team. Things that screw that up:
- Big Ten Champ does not receive a playoff bid
- We are not the 2nd highest ranked big ten team after the Big Ten Championship