They would have to look at where they were ranked when the game was played. For example, say we beat a #8 team; that #8 team won't be a Top 10 team after we beat them. So should we lose just so we could say they were Top 10? I don't think so.
Just looked at the 3 teams who were Top 10 when we played them: A&M, Auburn, and LSU. Every game they have lost has been to current Top 25 teams, except LSU's loss to Arkansas, and they should be ranked (certainly based on Herbstreit's criterion of how much a team has improved). Not only that, almost all the losses have been to SEC-West teams. We can only play 6 other West teams ... somebody has to lose.
Ordinarily, FSU's OOC schedule would be really strong, but this year Notre Dame, Oklahoma St, and Florida just aren't very good. The only constant cream puff team is the Citadel. They have no choice but to play in their conference, and it's always weak with the exception of "sorta good" Clemson and Ga Tech. Regardless, they play who they play, and their schedule this year is much, much easier than ours, regardless of what ESPN's power index says.