Yes, my point though was that if Daoshen had the capital and a valid claimant to the throne it SHOULD throw a feudal society with those links into chaos. For one, as far as we know no one has been recognized by the First Prince as the new March Lord. Shows like the Tudors, Game of Thrones, White Princess and others have demonstrated the politics of having a government based on family/blood ties. For instance in Tudors Henry was always careful about the placement and movement of his daughters Mary & Elizabeth depending on what the political winds were at the time, in particular keeping Mary away from her mother even though Catherine was dying b/c the would be a gathering of political power that his opponents could use to rally a force against him. While it was historical fiction and sensationalized, it IMO accurately reflected the maneuvering and precautions of the time to keep any potential rival from being backed with military power.
If Daoshen holds most of the Hasek House, then he can find someone to take the throne as his vassal . . . which gets to be a complication.
As far as Julian retaking New Syrtis, I thought a lot of the FS consensus was that he would not have the forces to keep whatever he might take in the moment. But I think he would need to do something about the Hasek heirs . . . and now that I think of it, the Sandovalls though at least they are in a bit better shape.