What I think my two posts above this illustrate about these rankings and the conferences (assuming the rankings are exactly accurate. We all know that they aren't, but just for the purpose of discussion I'm assuming that they are):
SEC:
If there is a weakness it is that they are a bit soft in the middle. They have #1 and two of the top-4 but after that they are a little scarce. They only have one team in the #5-#17 range while the other P5 conferences all have more than that.
ACC:
Solid, never #1 but never far from it.
B1G:
Very strong top-5 but a major drop-off after that and not quite as deep as the SEC and ACC.
B12/PAC:
Not quite as strong as the top-3, but not all that far off either.
MW/AAC:
They may look P5-like with three and four teams ranked or receiving votes but they are nowhere close. Their #1 teams would be 5th in the SEC, 6th in the ACC, 6th in the B1G, 5th in the B12, and 4th in the PAC.
Sun Belt/Independents/MAC:
Not even on the same page.