I'm having trouble parsing this. Are you saying that Jung's model should show convergence as opposed to divergence? From what I understand, the inherited archetypal form is quite basic and general, but is fleshed out according to the epigenetic qualities of a culture. One would anticipate a convergence in shared basic symbols (e.g. cross, staff) and general concepts (e.g. trickster spirit, mother). At the same time divergence is expected in specific details of the folklore and artwork (e.g. names, places, aesthetics). Convergence AND divergence are characteristic of the Jungian model, only they manifest in different realms of psychic experience: one unconscious, the other conscious. This is exactly what happens and fits the model pretty well in my opinion. The truth of the matter is up for debate, but Jung's theory is certainly consistent.

Perhaps I misinterpreted your criticism. Please correct me if this is the case. Nevertheless, I find this all very fascinating and will be following this thread with great interest.