Yeah I should've guessed, with the various ppl controlling different parts of the land, and with the 'royal demesne' being relatively limited (and the fact that the Daijo-Daijins can't move too much against them) means taking more power this way would be a very effective way to make money and get power from this. Maybe we see the Daijo-Daijins push for colonisation to increase the power they can wield?
Also do you think Japan would want to replace the Dutch as the overlords of the Sulawesi kingdoms?