He wants to bring the whole plane down, which means killing or displacing King and his loyalists. Delphinus is taking steps to prepare the way for that, though they haven't committed us yet, and I'm fairly sure I'm the few people off their team who know.
The safety of anyone with a Judge is trivial, or so I'm told. In order to see if we can free the people the earth has already taken, Messenger opened Surgeon's realm for us to search.