I didn;t really see this thread as selecting the best player ever in the history of CFB at each position, and I also think you are underestimating Vick in 98/99 and how he changed the game and was something nobody knew what they were seeing - its easy to compare him to someone 15 years later when the offenses and game has changed.
Also, Vick took a team nobody knew anything about to the national championship at 19 year old redshirt freshman...And dominated the game at that. If you are putting together a DYNAMIC COLLEGE TEAM, you're gonna be hard pressed to beat a team of aweome players with Michael Vick, hands down.
It's the same argument for Reggie Bush - nobody is saying he is better than Barry or Bo, but you put any defense in history up with top notch talent against top notch talent, and a Reggie Bush is going to get OFF on that field. I think greatest ever at a position and pick a unbeatable team are two different things.