There are 5 undefeated SEC teams in the top-10 right now, but that group is guaranteed 7 losses:
Cross-divisional UGA-Auburn and Fla-LSU, UGA-Fla, LSU-Auburn, LSU-Bama, Bama-Auburn, and the SECCG.
Best case for the SEC, and the worse for us is: UGA over Auburn and Fla, LSU over Auburn and Fla, and Bama winning out. That gives them an undefeated Bama and a 1-loss LSU and 1-loss UGA. ESPN would make the push that only undefeated Power-5 Champions should get in ahead of LSU and Georgia, and if Clemson is undefeated they're in. The only PAC-12 team currently undefeated is Cal, and that's not going to last long.
But without some more SEC upsets, things might require Oklahoma and the B1G Champ to be undefeated to get into the playoff.