Looking at the secondary of the Horns led me to look at the passing quality of the SEC compared to the BIG 12, which led to comparing the quality of the opponents of Texas Alabama and Florida. Each has played 8 games. So I looked at the NCAA rating (1-119) of each team they played for,  total offense, total defense, points allowed and points scored. Then took each of those ratings and averaged them for each team and got a single number for each team. Then I took the number of each team and averaged all eight of them  to get a rating of the competition each has faced. 

Florida had the worst rated competition at 60.9, Texas was second at 58.9 and Alabama was at 58.4. Pretty close.

So then I threw out the 4 worst teams each played. Then you got Florida with 45.8, Alabama at 40.0 and Texas at 33.6.

Neither Alabama or Florida played a Team that rated 33.6. The closest Florida came was Tennessee at 35. Alabama played Tennessee at 35 and Ole Miss at 33.8. Texas on the other hand beat OSU soundly even though it was rated 37.5 plus it beat Tech rated at 30.5 and the best team by far any of the three faced was Oklahoma at 17.3.

the big three ratings were,

Alabama 16.5

Florida  5.7

Texas 11.5

The top 4 defensive teams average that each three faced (combining Points allowed and Total defense).

Florida 19.3

Texas 18.9

Alabama 10.6

If you take the total offense and the total defense average of all eight opponents for each three you get,

Florida 59.8

Alabama 61.1

Texas 59.3

based on just those 2 categories it is really close again.

Based on the 4 categories Texas has played the best individual teams, Alabama has played the best set of eight teams average and Florida played the worst which may have to do with it's advantage being rated slightly higher than the other 2.

One note Florida did play one div-II team which means there rankings should be lower due to the fact that Charleston Southern is rated 44th in total offense, 80th in total defense, 78th in points scored and 105th in points allowed in Div-II so might assume to add 119 to each number if all Div I teams are better than all Div II teams.