If I was Froome I'd be extremely frustrated having to carry another rider for the second time on a grand tour. There is just the impression, like the Vuelta, that Sky is putting the brakes on him in order to deliver a win for a cyclist who is no stronger and probably less strong.
In some ways, the situation reminds me of Cunego in the year that he won the Giro (he was there to support someone else, but in that case simply asserted himself as the lead rider, despite the protestations of - from memory - Simeone). Part of me wishes that Sky would give Froome the freedom to go for it, because at the moment it feels to me that we are going to end up with the weaker Sky rider being placed higher up the order. That said, I suppose he is in an impossible position as Brad seems like a huffy chuffer who would throw his toys from the pram if dropped from number one slot.
Fingers crossed Froome gets to lead a team next season.