Since Basso managed quite nicely with only one climber, CSC could afford to pursue the MV as well - after all, O'Grady doesn't need a lead out train and is capable of nicking points in all sortd of places.
And what a feather in the cap for Riis - emulating his old team and taking the MJ, MV and (probably) best team prize in the TdF.
You have to remember, not every DS is in thrall to Bruyneel and some remember when it was perfectly acceptable to have wider ranging ambitions in a GT than just winning the race...