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Presumably the chainring losses are roughly similar for every rider which is why no-one complains about them. Around 6% seems plausible when you remember that for cars crank horsepower is usually 15% higher than wheel horsepower. Transmission losses are an unavoidable cost.

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TFA with its 6.06 W/kg estimate is talking about power at the wheel, because it's using Strava rather than e.g. PowerTap data. (Although Strava claim to account for "rolling resistance".) By making the adjustment Sky seem to be claiming that Froome's equipment wastes less power than everyone else's does. Again, if they spell that out, Talo will be happier than Shimano, their nominal sponsor.

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