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B1G-E:

• 6-0 Michigan:  Controls their own destiny.  
• 5-1 Ohio State:  Controls their own destiny.  
• 4-2 Michigan State:  Needs M to lose out or:  Needs to win out and M to lose to either IU or RU and tOSU to beat M.  That would create a three-way tie between M, MSU, and tOSU at 7-2 with each being 1-1 against the other two.  Michigan would be eliminated on tiebreaker #2 Divisional Record because their other loss was in the Division.  Then it would go to H2H between the Spartans and Buckeyes and in this scenario the Spartans would have a H2H win there.  
• 3-3 Maryland:  Has a theoretical mathematical chance to at least get to the third tiebreaker but it involves Michigan losing to Rutgers so yeah not happening.  
• 3-3 Penn State:  Mathematically eliminated because the best they could do is a tie with M at 6-3 and the Nittany Lions lost to every team that could possibly be included in that tie (M, tOSU, MSU).  
• 1-5 Indiana:  Mathematically eliminated.  
• 0-6 Rutgers:  Mathematically eliminated.  

As a practical matter the B1G-E is between tOSU and M but Michigan could clinch early if Ohio State drops either the MSU or UMD games.  

B1G-W:

• 5-1 Northwestern:  Controls their own destiny and can afford to lose any of their remaining games (just not two without help).  
• 4-2 Wisconsin:  Needs two NU losses.  
• 4-2 Purdue:  Needs two NU losses.  
• 3-3 Iowa:  Needs one NU loss, one UW loss, and one PU loss.  They could NOT win a three-way tie with NU and either PU or UW because that would come down to record against the next best team in the division and Iowa would lose that.  They would also lose a four-way tie with NU, UW, and PU because they would be 1-2 H2H2H2H.  
• 2-4 Illinois:  Has a minute mathematical chance* but no practical chance.  
• 1-5 Nebraska:  Mathematically eliminated.  
• 1-5 Minnesota:  Mathematically eliminated.  

As a practical matter this is between NU and the UW/PU winner but the UW/PU winner needs NU to drop two of their last three (@IA, @MN, vIL) so there is very little chance.  

*Illinois' mathematical chance is this:

• Win out to finish 5-4.  
• NU loses out to finish 5-4.  
• The PU/UW winner loses out to finish 5-4.  
• The PU/UW loser loses out to finish 4-5.  
• Other than their loss to ILL, Iowa wins out to finish 5-4.  

This creates a four-way tie between Illinois, Northwestern, Iowa, and the PU/UW winner.  Illinois and Northwestern would be 2-1 in the H2H2H2H while Iowa and the PU/UW winner would be 1-2.  That would then be decided by the H2H among the two 2-1 teams (Illinois and Northwestern) and the Illini would win that.  

At least the SEC made it easier for your there, already decided, a done deal, earliest in history.

It is odd that the SECCG is set over a month in advance.  

This is the earliest the SEC has ever been decided since divisional play began.  The teams in the West have two conference games remaining, in the main, but the top four teams in the East have but one.

It sounds like Iowa needs, in addition to NW losing at least 1 other game, also Wisc and Purdue need to both lose twice.

Sounds like Iowa can't win any tiebreakers other than a 2-way tie with NW.

That is pretty much it.  
They can give NU a second loss this weekend but that just puts NU, UW, and PU one game ahead of Iowa in the loss column.  Next weekend either PU or UW will lose.  That helps but it is far from enough because the tiebreakers are not kind to the Hawkeyes.  I do not see any mathematically possible tie that Iowa would win other than the one you mentioned, two-way with NU only.  

Go BUCKY!

so, the East had a good home field advantage this season.  Hopefully, this is reversed in 2019