yeah maybe he is the superior cause zexion says "a scent enter the castle similar to the superior, no exactly" and we now know that diz is not the leader and remember ansem did control riku, so riku's scent can only be related to ansem, so i bet ansem is the leader, and he might be making diz do the work since ansem is to weak now, and for all we know diz probably has plans of his own i mean diz doesnt seem like a bad guy