Pick your two teams to play in the BCS title game.

So you're saying that a win over USC in 2010 would prove that LSU was a better team than USC in 2003?
No, the crystal ball that LSU has says they were the better team than USC in 2003. A win in 2010 would prove they were STILL the better team and leave little room for dispute by the West Coasters.

I would root for USC in that title game specifically because of this attitude.
Such is your prerogative. Although I am not sure wanting to prove yourself on the field is an "attitude".

PS If Ole Miss was playing in the BCSCG, I would put aside my in-bred disdain for them and cheer for them for the good of the conference.