... reported the boldest step forward in Big Ten expansion to date. Citing their multiple sources, the Big Ten has "extended initial offers" to four schools: Missouri, Nebraska, Rutgers and Notre Dame. If all four were to accept, the conference would stand at 15 teams, likely in need of another. Assuming Notre Dame declines at this stage, an even 14 members would make for a more manageable number with respect to forming multiple divisions and a holding a conference championship game. Let's rank and evaluate the likelihood of each potential candidate joining the Midwest mega-conference, from least likely to most likely.

Bleacher Report - College Football