No matter how you slice this there is always going to be a perceived SEC bias if more than 1 SEC team gets in.
What's funny is that if Ohio St. wasn't on probation and the records stayed the same it would have been OSU vs. ND in Miami and Bama is shut out. No SEC bias, and we know what happened on the field. Last year would have been (as an example):
1. ND
2. OSU
3. Bama
4. Oregon
3 & 4 were clearly more talented than 1 & 2.
I don't see how a committee would keep an inferior ND or OSU team out of the playoff when UGA, UF, or aTm would have spanked any of those teams in a playoff game. So are you guaranteed the 4 best teams in the playoff? I don't think so.