Moral Pluralism, Heliocentrism, Solipsism

Kant's Moral doctrine is Pluralistic, populated by a multiplicity of rational beings, each of which, as an end-in-itself, is a noumenal entity.  Now, according to the standard interpretation of his 'Copernican revolution', the subject of Experience is analogous to a heliocentric system, with Reason as its 'Sun'.  However, as stated, in Kant's doctrine there are a multiplicity of such subjects.  Hence, granting the standard interpretation of his 'Copernican revolution', it follows that the astronomical metaphor that is appropriate to Kant's doctrine is a galaxy, not a solar system, which, as literally 'solipsistic', is antithetical to the doctrine's Pluralism.