Peter, His Concept, and Spontaneity

Here’s my problem:  God’s CCC of Peter - what does it have to do with the actual Peter?  Does the nature dictate to Peter what he *will do*?  That doesn’t seem to give us the right sort of spontaneity.  For a concept is not a substance, and is not the same as causing a state.  So the dictations shouldn’t go from Peter’s nature to Peter himself, but from Peter himself to Peter’s nature.  So God’s CCC of Peter is *about* Peter himself, following his track.  So the CCC tracks Peter, or possible Peter, found as he is incipiently in God's power-to-create.

This is similar to the worry here.