If you dont have preseason rankings and 15 teams all win game 1 how do order them? Based on who they beat or how well they played? But even that is subjective and may negatively impact a team for the rest of the season if they just played one bad game. If Floridas first game was against Auburn and they lost, starting polls from that game on could kill their chances for a BCS game but because you had preseason polls and both are ranked high it isnt as devestating a loss. Or a team like WVU who doesnt play anyone may never get into the top 5. I dont see how you get around neading preseason polls, they just shouldnt count for as much later in the season. If you clearly got it wrong, dont be afraid to rework your poll mid way through the season for example. Or just wait to have any rankings until a few weeks into the season like the BCS.