Objection! Assuming facts not in evidence: that it would have been Rome that would have had to modify its position. As a lawyer I am surprised at you. : )
“...that it would have been Rome that would have had to modify its position.”
Seems to me that argument is long over, P and Rome lost it. Frankly, calling the Easterners heretics because we had “cut the filioque out of the Creed” was really beyond the pale. If it is still Rome’s position, and I don’t think it is, that it can change the wording of the Creed sua sponte, then there really is absolutely no point whatsoever in any theological dialog between Rome and the East if the point of the dialog is a reunion which will never happen.