He was willing to take the risk involved in creating the army of divine beings because even if a divine being blabs, it wouldn't do much harm, because no divine being knows exactly what he did to upgrade their Divine Metacs.
All they saw was him taking their Divine Metacs and returning them upgraded. There are many reasons to explain what he did, and he never revealed that the Divine Positions came directly from him, so he was sure that his secret was safe.
The surveillance of the Geminis and the guardian is also why he removed sensitive Divine Metacs from Fenrir when he wasn't using them. One example of such a sensitive Divine Metac is the Rewind Metac.
He kept the Rewind Metac removed from the Devouring Supreme Metac most of the time and would only bring it back when he needed it. He started doing this from the moment he was forced to have a son.
