Will to Power and Obedience

Among the important theses in Nietzsche's doctrine of the Will to Power is that an act of Obedience is an instance of the fundamental principle.  Conversely, if it is not such an instance, then the Will to Power is inadequate as an exclusive principle, and, accordingly, the Command-Obey structure is not inherent in Nature, contrary to what he asserts in places.  Also notably dependent on the thesis is his conclusion in On the Genealogy of Morals, that "men would rather will nothing than not will", which is central to his diagnosis of Nihilism.  Now, his apparently strongest defense of the thesis, from 'Of Self-Overcoming', in Thus Spoke Zarathustra, is that "the will of the weaker persuades it to serve the stronger", because "its will wants to be master over the weaker still."  However, while this is an unarguably accurate observation in many cases, it seems only to reduce the apparent 'will to serve' to the will to master, thereby essentially denying the reality of Obedience, rather than explaining  it.  It thus leaves unaddressed his diagnosis elsewhere that Obedience is frequently the product of a Will-quelling anodyne illusion, which seems to agree with Marx's famous statement about an "opiate", as well as common examples where one simply wants to 'let go'.  The defense also has little relevance to his writ small examples of 'Obedience', e. g. the exercise of the muscles, analyzed in #19 of Beyond Good and Evil.  So, Obedience remains problematic, at best, for Nietzsche's doctrine of the Will to Power.