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Recruiting some more people and getting the mechanics and other support staff to hand out food and water during the day during the key mountain stages seems to me a cost worth paying.
Its not like they are delivering musettes using drones (although that would be tres cool) or shuttling helpers around the stage by helicopter...Get 3 people to drop 12 extra people off in different places on the course and collect them afterwards. 15 extra helpers, can't cost more than a couple of grand extra per stage.
Perhaps Movistar should use their prize money from the team classification to invest in this tactic in future....
To be fair, a lot of the snake-oil is sold by SKY themselves. They always purport to be doing something different and better, people have just bought into it now. They don't even have the biggest budget in the peloton.