3 additional teams. Bama, Auburn, LSU, Georgia, TAMU, Florida, and Missouri have been top 10 teams since 2015.
The Big 10 has had the teams I listed above plus Nebraska.
And I'm not diminishing the rest of the SEC because Bama has been so dominant. Georgia has been good but not great, just like Michigan has been good but not great. They've both had one team stand in their way. The same can be said for Penn St, Iowa, Wisconsin, Auburn, and LSU in that timeframe. So why is it that Auburn, LSU, and Georgia are considered superior to Penn St, Michigan, and Wisconsin? Because the SEC bias exists, not because they have earned it. UCF has proven it is capable of competing with the SECs 1a tier over the last 2 years but they aren't given ANY respect. The bias exists, period.