The Big Ten for 80 years was Michigan and Ohio State and then one program who would have a good year (Wisconsin, Iowa, Minnesota, etc)
Then they added Penn State and there were usually 3-4 decent programs
Then they added the Pac-12 schools and USC, Washington and Oregon are decently good too...
So they have more depth than they did preexpansion, but this "taking over college football from the SEC" is silly
During their "magical 2 year run" the Big Ten still has a losing record to the SEC head to head, and I bet that both OSU and Indiana don't win a playoff game this season