I don't mind Fulmer being in the discussion. I don't think he's the right answer, but if we're just talking about BCS era, he's absolutely in the discussion.
Look at his years sans Peyton.
Peyton's first year UT was 1-3 without Peyton as a starting QB. They finished the year 8-4 once he was named starter.
With Peyton as his QB, Fulmer was 39-6. A winning percentage of 86.6%
Without him he was 113-46. A winning percentage of 71%
Fulmer was a good coach, don't get me wrong, heck he won his only National Title without Peyton.... but if we're simply going from the BCS era. Fulmer's gotta be in the bottom 3 along with Coker & Chizik.