Northwestern’s center went down in the Iowa game (which was tied at the time, but Iowa took advantage of his absence), and there’s a rumor he has a broken foot and may miss the rest of the season.
If Nebraska and Northwestern wind up tied in the conference standings, Nebraska wins on tiebreaks, as they split the season but Nebraska has a 1-0 record against Purdue and Northwestern has a 1-1 record.
If you want to play with ‘what happens if…’, here’s a site that you can use: