15thc perception on swallowtail merlons?

[Koen G]

Well found! That's a small detail in such a busy scene. There are a few other overlaps with the Rosettes as well, like the mandorla shape and the rose window framework.

(This is irrelevant, but the central emblem of the Jesuits must date to the 16th century. It looks like it may have been expunged at some point).