I noticed that the Byzantine Empire doesn't have many changes in dynasty or usurpers, and some people have been mentioning that on the forums. At the moment it seems that because only the family in charge gets claims, only they can control the throne unless somebody else marries into claims. Maybe there should be a plot for all (maybe just Greek?) Douxes and Despots in the Byzantine Empire to fabricate a claim on the Empire so that they can get a fabricated strong claim that doesn't get inherited (kind of like chancellor claims), but that they can use it to form a faction to take the crown. Maybe this would help simulate situations like Alexios Komnenos becoming emperor or any of the other major changes in dynasty and usurpations.