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It is easy to see who the three protected rivals of Wisc., Nebr., Iowa, and Minnesota would be. Maybe Wisconsin would not be a protected rival of Nebraska, and instead have one or both west coast teams as protected rivals along with Iowa. It becomes more difficult to identify three protected rivals for most of the rest of the Big Ten, including USC and UCLA.
I am not sure USC and UCLA will want to more regularly cross three time zones to play teams in the Eastern time zone, or that Eastern teams will want to cross three time zones regularly to play night games on the west coast.
It will be interesting to see how they work this out.
Historically, the only Big Ten school USC does not have a winning record against is Penn State -- against whom USC is 3-3. The west might start winning divisional championships with USC joining the BTW.

I could see USC getting NW and MSU as its 2 other rivals.  USC and NW are both private schools in large metro areas.  USC and MSU both have that Greek mascot theme.

UCLA could maybe get Nebraska and Wisconsin as its 2 other rivals instead of Neb-Wisc playing each other.  Nebraska probably wants to play in California more and Wisconsin could use a more high profile rival. 

Illinois is another good possibility for UCLA or USC.  Illinois could also use a more high profile rival.

Here are all of the inter-divisonal games this year:

• PSU 35, PU 31 at PU
• IU 23, IL 20 at IU
• tOSU 52, UW 21 at tOSU
• MN 34, MSU 7 at MSU
• IA 27, RU 10 at RU
• M 27, IA 14 at IA
• UNL 35, IU 21 at UNL
• PSU 17, NU 7 at PSU
• UNL 14, RU 13 at RU
• PU 31, UMD 29 at UMD
• MSU 34, UW 28 at MSU
• tOSU 54, Iowa 10 at tOSU
• UMD 31, NU 24 at UMD
• PSU 45, MN 17 at PSU
• MN 31, RU 0 at MN
• tOSU 21, NU 7 at NU
• MSU 23, IL 15 at IL
• UW 23, UMD 10 at UW
• East leads 11-7
• UNL at M, 11/12
• IL at M, 11/19
• PU at IU, 11/26
• BIGCG

The East has clinched a regular season win and at least a tie overall.

Oh well, the West will get one last chance for redemption in 2023.

The West also gets home field advantage in 2023 with 14 of the 21 regular season games in B1G-W stadiums.

nah, I'd prefer Black Friday home and home in Lincoln & Iowa City

really think attendance would suffer trying to get fans to travel on the holiday weekend when they usually spend time with family