More in depth on the teams closest to the bubble:
Significant work to do:
14-13/7-9 Purdue: Covered above by
@bwarbiany and I.
6-8/12-12 Minnesota: As I stated above, the biggest problem for the Gophers is their .500 overall record. I believe (per a google search) that the most losses EVER for an at-large team is 15. Minnesota would have to go no worse than 4-2 in their last six regular season games to end up with 15 losses and in the at-large conversation. Their last six games are IU, UMD, and UNL at home along with NU, UW, and IU on the road. Going 4-2 would not be implausible. They'd need to win the home games (or possibly lose at home to UMD) and win the NU (and possibly IU) road game(s). Even that, however, would only get them to 10-10/16-14. They would still probably need at least one win in Indy.
Work to do:
16-10/9-6 Wisconsin: The best news is that three of their final five games are at home (RU, MN, NU). Winning just those would get them to a final record of 19-12/12-8 and I think that would be enough even with a quick exit in Indy. They should be fine and if they win their next three (vRU, @M, vMN) I'll call them a lock at 19-10/12-6.
18-8/9-6 Rutgers: The Scarlet Knights have a very difficult stretch run. Three of their last five games (UW, PSU, PU) are on the road and one of the two home games is against Maryland. They look good where they are right now, but it isn't difficult to imagine them going 1-4 or worse down the stretch to finish 19-12/10-10 or 18-13/9-11. Their OOC is not as strong as most B1G teams so that might not be enough. If they lose at home to Michigan tonight they could be in big trouble and remember that they already lost to Michigan in a virtual home game at MSG.
17-8/7-7 Ohio State: The stretch run for the Buckeyes is interesting. They have three home games but one of them is Maryland and three road games but one of them is Nebraska. We project them to win the home games except UMD and lose the road games except UNL and thus finish 20-11/10-10. I find it interesting because it wouldn't be shocking for them to finish either 4-2 or 2-4. That translates to a huge difference in final regular season record between 21-10/11-9 and 19-12/9-11. Add in an upset one way or the other and this could be anywhere from easily a lock heading into the BTT playing for maybe a #5 seed or a bubble team heading into Indy.
16-9/7-7 Michigan: The concern for the Wolverines is that four of their last six are on the road (RU, PU, tOSU, UMD). It also would not be shocking for them to lose at home to Wisconsin so a 1-5 stretch run to finish 17-14/8-12 is not implausible. OTOH, if they win the home games and steal a road win they'll be pretty comfortable at 19-12/10-10.
16-9/6-8 Indiana: The Hoosiers finish with three at home (PSU, MN, UW) and three on the road (MN, PU, IL). The major concern for them is that, like Rutgers, their OOC is not as strong as most B1G teams so a 3-3 stretch run to finish 19-12/9-11 might not be enough. If they lose one of the home games and fail to compensate for that by stealing one on the road they could be in big trouble.