I'm really having issues seeing the workability of an 18 or 20 team conference. Just seems to water down the desirable match ups each year (even with the Big Ten at 14 teams, it seems like you have way too many years where good teams don't end up playing each other).
A big question with pods for the Big Ten is do you group Michigan, OSU and Penn State together because of geography geographically or separate them because it can even the balance of the league.
A pod of NW, Indiana, Purdue and Illinois is not good unless it gets Michigan, ND or OSU added to it. At least the western pod could have Iowa and Wisc as two consistent football programs.
I do see how the Big Ten could work with a 5 or 6 team pod from the Pac and filling in with a few teams like ND, ISU, KU or an ACC team if that becomes possible.
It's now likely impossible any conference can match the SEC on the field. Big Ten/Pac merger alliance probably beats them in some other ways.
They tried being a little loose with geography on the leaders/legends thing and settled at east/west instead.