I understand the difference.
Ok so the B1G has four yes 4 teams in the top 50 in total offense. Wisconsin(20), Ohio state(11), Michigan st(14) and Nebraska(33). So while the B1G might have 4 in total defense it's because the B1G doesn't put up any offense
The Sec has 7 teams in top 50.
The big 12 has a shitload of teams in total offense. That conference must not play any defense.