Prior to 2008, the Big 12 South was the most dominate division in college football. Week 9 of 2008, Texas is ranked no. 1 in the AP, with OU at 4, Tech at 6, and Okie State at 9. That week, Tech beats Texas allowing Bama to reach the number one spot in the Saban era. Florida would end up winning the MNC that year and the Big 12 would have a few decent wins. From what I can tell from my research online, that was the defining week and season where the most dominant division in CFB went from Big 12 South to SEC West.