This is from an article in Velonation from last year.
Froome has said that he would like to have leadership of the Sky team if a more mountainous 2013 Tour route favors his strengths over Wiggins’. Barring injury or other catastrophic change to Wiggins’ form, that will not happen, regardless of the route. Wiggins is and always has been the team’s darling, its marquis rider. The current yellow jersey is as already a British Olympic hero, a Commander of the British Empire, an avowed Mod as comfortable being wrapped in the Union Jack as Pete Townshend. For a British team backed by the nation’s cycling federation, it doesn’t get much more ideal. Should Wiggins return to the Tour as defending champion and not receive the full and unquestioned support of his team, there will be a national outcry.
Froome might be stronger than Wiggins this year, and he may be stronger next year, too. But as a born-in-Kenya, raised-in-South Africa rider whose British citizenship and racing license are reflective of his father’s country of birth, Froome will never be management’s preferred choice if both men are within reach of the victory. In professional cycling, being the more marketable rider is sometimes more important than being the stronger one. Sky may be able to pacify Froome with a Giro or Vuelta arrangement, but if both men are on the Tour’s start line for Sky next year, the most Froome can hope for is to inherit leadership on the road.