I think you made the case for a major disjoint occurring right after the first Apostles.
I don't believe that the claim is that there was no time when the histories of the Catholic and the Protestant and the Orthodox churches were joined. I think you made the case for a major disjoint occurring right after the first Apostles.
I said that the church's foundation was completely laid during the era of the Apostles.
There remains no more need for the laying of any foundation than the one which Christ and the Apostles laid.