The lengthy discourse of the Protectorate Duke was simply that Jin Zijin had returned from abroad, and furthermore, his previous identity was indeed a member of the Dao Family. His disaster relief efforts might well lead the common people to attribute this merit to the Dao Family, which had nothing to do with the Imperial Court in the end.
After all, Jin Zijin's influence within the Dao Family far exceeded that of the Imperial Court.
But King Jin was different. He was the mutual child of the Emperor and Empress, of unmatched noble status. It would be a grand display of the Emperor's grace for King Jin to make an appearance, truly representing the Imperial Family and the Imperial Court.