I was thinking of only using it as a starting point-the character would be shipwrecked on the little island you showed on the map and originally sent by one of the Enclave's departments, the External Security Bureau, to gather intel. Once he was shipwrecked he would have no backup, no contact, and would have no reason to advertise his allegiance. 

Once you chose to bring the full Enclave into play, he would obey your orders.

Would that be okay?