Nebraska makes the move based on their stomping of previously undefeated K-State and Boise State does it based partially on their convincing win, but more based on previous opponents VaTech still improving and Oregon State knocking off previously undefeated Arizona.
To understand this, it can be helpful to look at the performance charts for the teams.
Oregon's #1 is based on them playing their best in their two most meaningful games (larger dots) against ASU and Stanford.
Nebraska has also played well in their meaningful games.
Boise State has been very consistent and like noted above is being helped by Va Tech and Oregon State improving since they played.
And Ohio State has been very consistent, but doesn't have a really big result to pull them higher.
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Full rankings on the site, but top-30 below for quick reference.
|3||Boise St||87.483||5-0||67.561||+7, +3.017|
|4||Ohio State||86.672||6-0||63.035||+0, -1.407|
|11||Florida St||82.258||5-1||67.847||+16, +6.234|
|14||South Carolina||81.727||4-1||69.233||+15, +6.262|
|18||Michigan St||79.891||6-0||62.342||+20, +6.807|
|19||Arizona St||79.597||3-3||73.086||+11, +4.532|
|20||Virginia Tech||79.382||4-2||69.765||-6, -1.109|
|21||Oregon St||79.194||3-2||80.247||+15, +5.552|
|24||Miami FL||77.930||3-2||70.518||-15, -6.589|
|25||North Carolina St||77.791||5-1||65.256||-1, +1.339|
|26||Air Force||77.552||5-1||62.609||-1, +1.258|
|27||Southern Cal||76.740||4-2||69.896||+12, +3.776|
|29||Oklahoma St||75.653||5-0||61.592||-3, -0.480|
|30||Mississippi St||75.548||4-2||64.945||+15, +4.223|