Practical Reason and Copernican Revolution

As has been previously discussed, appearances, for Kant, are fundamentally events.  Now, in his system, a special case of Event is one entailing spontaneity, i. e. Action., the most intimate example of which is the appearing of a Mind to itself.  In other words, on this model, the appearing Mind is not a bare static 'I', but a performing one.  Hence, just as the transition to an Event ontology is one expression of Kant's 'Copernican revolution', the transition of atomic Subjectivity to Agency is another, which could explain why his allusion to Copernicus is not presented until after his development of the concept of Pure Practical Reason.