Why does/did the Roman Church allow Uniate churches (previously Orthodox Churches who came into communion with Rome) to keep their saints? Even 'problematic' ones like St. Photius, St. Mark of Ephesus, St. Gregory Palamas, etc.
Also, if an Orthodox Church, like, say, the Russian Orthodox Church were to come into communion with Rome today, would they have to drop their saints who lived and died after the schism?