[Tantumergo]

""Subsist" was used instead of "is" precisely as a concession to other Christian churches, especially the Orthodox."

Prove it - don't just assert it like a mindless parrot!

"It was meant to suggest--and does--that the Church of Christ exists elsewhere and is NOT identified solely with the Catholic Church."

Show me where in any school of classical theology that any entity can have more than one subsistence.

You will never help the cause of Tradition by promoting falsehood.

[ultima ratio]

Here is what Cardinal Ratzinger himself has said:

"When the council fathers replaced the word "is" with the word "subsistit," they did so for a very precise reason. The concept expressed by "is" (to be) is far broader than that expressed by "to subsist." "To subsist" is a very precise way of being, that is, to be as a subject, which exists in itself. Thus the Council fathers meant to say that the being of the Church as such is a broader entity than the Roman Catholic Church, but within the latter it acquires, in an incomparable way, the charater of a true and proper subject." L'Osservatore Romano, October 8, 2000.

In this quote by the Cardinal, it should be noted that when he uses the phrase "the Church" he means something broader than "the Catholic Church." He means the "Church of Christ" which includes, according to him, the Orthodox churches and other Christian bodies.

[ultima ratio]

"Show me where in any school of classical theology that any entity can have more than one subsistence."

You are confusing two different words--"substance" and "subsistence." For something to "subsist" in something means that it exists UNDER some other entity not itself. It does NOT establish identity.