While I don’t disagree with most of what you said, the top of the Big 10 (OSU, Mich, Penn St) has been better than the top 3 in the Big 12.b10 is a fraud conf (even as currently constructed)...
last 20 yrs current b10 teams have won 3 titles.... Mich, OSU, USC.
OSU is often the only team that can compete with the top tier in the sec in the whole conf. Yet, you have teams like iowa beating their chest because they beat up ill, neb, min, nw, purdue, msu, etc... and then get pounded by osu.
Mich has stepped up recently (may not be back for a while), and USC has had good years historically, but have not won the champ for 20 yrs and since carrol have not really been the same.
There are brands and teams that have won in the past and they will have a lot of money to compete in the future. But there is OSU and no one else in the conf that has consistently been better than top teams in the B12 (TCU beat mich in the play off 2 years ago).
Not saying B12 has multiple teams significantly better than b10 runner up every year, but b10 is suspect beyond OSU most years. Problem is brand value is significant and impacts rankings.
I’m going to be called a Big 10 fan (again) but since 2014 the Big 12 is 14-20 against the Big 10. The Big 12 has done nothing to help the narratives against it.