He's not wrong though. He's more than capable of taking 5 minutes off Wiggins before the TT, then holding on to yellow into Paris. It'll be interesting if Brad cracks big-time and Nibali attacks. Will Sky get Froome to chace and save the team the race, or look after Wiggins and maybe lose everything?
Sky are in this for a Sky win, rather than a BW win. It's set up for BW as that was the strategy they felt gave them the best chance. If BW fell apart, of course they'd push Froome to the fore, just as they'd have a contingency plan for if BW crashed out, or got injured.