With everyone out of prison and loyalists to the prince now in full force, isn’t a coup de’etat against the younger prince possible to pull off? I imagine civil war at this time would be extremely bad for them but they would get destroyed by other nations at this time anyways.
@Koyomiya you have to consider that certain institution still only follow the decree. Meaning if if they have a bigger group than before to support, they proably don't have enough manpower to have an infight and the logistics to fend of an invading force at the same time.