It is hard to say about some of the middle big 10 teams. Purdue has been playing pretty well, with its 3 loses being very close games. NW plays to the level of its opponents. Plays great against good teams, plays like garbage against bad ones.(see it vs Mi and rutgers) Indiana isnt half bad either. Maryland beat texas. I think OSU can bounce back. How well, im not sure.
Iowa lost to WI in game where i think iowa was the better team, but made 2 costly turnovers on special teams. If they keep playing the way they are, they will win the west and take on probably a one loss OSU or MI.(still need WI to lose another game) They will probably be in the top 15 if not top 10 if they win out before championship. So whoever the big 10 champ is will probably win against a top 10 team.
washington and oregon were the 2 best teams of the pac 12, but they dont seem too impressive.
anyways, i doubt 2 sec teams will be in it. You have bama clemson, ND as 3 of the 4. after that, you have LSU, MI, and texas. i think if one of those teams lose, they are out. you would need help from others to get back in. You still have other possibilities that are a more remote.(like Iowa winning out as an example and WI losing. doubtful, but it could happen) WI is out of it. i think OK still has a chance. i think florida and georgia are in it too, even if unlikely. i dont think WV has a chance.