The argument about ground idle power is only valid to a degree. The minimum pitch on ground (MPOG) with the lever fully down is not 0 angle of attack. The setting has more to do with autorotative performance than anything else (in fact most of the collective travel is for power off, power on is only a small range). As an aside, the MPOG torque is a useful guide to whether or not the autorevs are correctly set up (torque high, revs low).
I'm not sure why people feel it necessary to include factors that aren't really related to profile drag. The drag on the blade is a stand alone factor that will be constant for a given blade on a test bed or different a/c. The power required of the engines is something else, and it is true to say that there is absorbtion by the transmission and ancillary drives, as well as the TR but why corrupt the meaning of 'profile' drag just because there is no convenient title?
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Another day in paradise