If you look at objective measures like Massey conference tables the SEC looks remarkably like every other P5 conference. For example SEC third team is ranked 32 twelfth 61. Big 15 & 124. ACC 16 & 75. Big 12 11 & 80. Pac 8 & 102.
I don't see the difference using objective measures. Actually your Pac12 listing looks worse than several others. Is there some deeper level of analysis? I admit I just looked and didn't do any averaging of teams 3-12.
If you look at his conference list that includes all teams the ratings are very close.
Computer ratings and rankings for CBW (College Basketball Women's), with links to team predictions, scores, and schedules.
masseyratings.com
Fyi some of the pages used:
Massey Ratings - Southeastern Conference
Big Twelve Conference scores and predictions for each game of the season's schedule
masseyratings.com
Atlantic Coast Conference scores and predictions for each game of the season's schedule
masseyratings.com
Big Ten Conference scores and predictions for each game of the season's schedule
masseyratings.com
Pacific Twelve Conference scores and predictions for each game of the season's schedule
masseyratings.com