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Also riders need to pick up stage wins whenever they can, especially domestiques, who will do a shit-ton of work and watch their team leaders pick up all the world tour points at the pointy end. World Tour points = future employment.
Contador knew what he had to do to win and fell just short of that. Henao was lucky that the GC competition was lively and he got plenty of help in chasing him down.
Do you actually understand racing tactics? The 'no-pull wheelsucker' from QuickStep (not Astana) had been in the break all day, and was there to help out if his team leaders bridged across to him late in the day. He sat on Contador because the latter was threatening his team mates' GC position, so his job is to stay with him and win the stage if they stay away to compensate for the loss of GC position. Which he did. It's notable that Contador, who had done all the work, had no complaints whatsoever as he understands how it works.