Reading from the published works of the various ecumenical commissions and learned theologians of both Roman and Orthodox backgrounds,one can't help but come to the conclusion that this issue is where the dialogue bus comes to a dead stop.
As the OP reminds us, at least at the highest levels of the churches, our spiritual leaders are engaged in cordial and fraternal exchanges of ideas and thought. It beats the alternative.
Before the meeting of the Joint International Commission
for Theological Dialogue Between the Catholic Church and the
Orthodox Church on Cyprus in October 2009 the bishops of the Greek Church
studied the Ravenna document and also the "Cretan Unia" a document composed
a year earlier on Crete which was created to form the basis of the
discussion on Cyprus -- and they were horrified by the extent to which the
documents are receptive to unorthodox teaching and especially on
ecclesiology and the concept of a universal primacy.
So they clamped down on the Dialogue, hard. At their Synod prior to Cyprus the
bishops ordered that Statements must not be issued by the International
Dialogue until they had been examined and approved by the bishops.
Metropolitan Zizioulas was thoroughly alarmed by this, and the word enraged
is not unfitting for his angry reaction. He wrote a nasty letter to the
Greek bishops accusing them of being obscurantist and of making themselves
look medieval in front of their flocks. His letter is on the web and I
shall find it. The bishops replied; they had the good sense to ignore
+Zizioulas' crassness and simply rejected his accusations.
Since then you will notice that neither Cyprus 2009 nor Vienna 2010 have
released any Joint Statements. They cannot do so without explicit approval
from the Greek bishops. The Meeting scheduled for 2011 has not taken place.
The bishops, hardliners on matters doctrinal, are now the adjudicators of
the Dialogue. Glory to God!
PS. You can find that letter, and the response of the Greek Synod of Bishops and
quite a lot of other documentation herehttp://www.impantokratoros.gr/root.en.aspx