Secular view, ping!
Maybe it’s too early in the morning for my brain, but I really can’t understand how one can go from a Thursday to a Friday by adding 10 days. Or 11.
I guess it’s just by fiat? It was just declared that for that special time, warping ahead 10 days still gave a sequential order to the days of the week? I guess it makes sense; after all if Pope Gregory didn’t do that then the historic weekly rhythm would be lost and the holy day of obligation that is Sunday would actually be a “Wednesday” or the historic “4th day of the week”.
So I guess that’s both how and the reason a ten day leap still “preserved” the historic sequence of the week. By simple fiat. So I guess I answered my own question (unless someone disagrees)