Rearfoot posting for Reearfoot Varus/ Valgus

I have been told that a varus rear foot post will bring both a rear foot varus and a rear foot valgus into proper alignment. For some reason I fail to see how a varus post will bring both deformities into alignment. Does a varus rear foot post bring both into alignment or is there something that I am missing such as positive cast balancing

I have been told that a varus rear foot post will bring both a rear foot varus and a rear foot valgus into proper alignment. For some reason I fail to see how a varus post will bring both deformities into alignment. Does a varus rear foot post bring both into alignment or is there something that I am missing such as positive cast balancing

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Rearfoot posting for Reearfoot Varus/ Valgus