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I think every race he starts, he does so with the intention of winning. But the proximity of the Vuelta to the Tour, with the Olympics in between, makes managing peaks of form very, very complicated. So Sky will start the race with Froome as the nominal leader, but will keep Landa in contention too just in case (although Landa's season has been so mixed it'll be no surprise if his form is a bit off too).
Froome rode the Vuelta in 2012, after coming second in the Tour behind Wiggins and getting a bronze in the Olympics TT, and came a distant fourth behind Contador, Valverde and Rodriguez. He was clearly running on fumes at the end.
So is Froome just using it as prep for next season with any form a bonus?