As I said in my previous post, and as this video stresses much more emphatically, they all stress the inherent unity of the Catholic Church from the Apostolic Age onwards, and its inherent unity, despite so much upheaval and suffering from just after the chalice was made to the calmer times of the restoration of the Hierarchy and the building of Westminster Cathedral, in England.
The video can be viewed at From Crozier to Cathedra: The Installation of Westminster’s 12th Archbishop