From “The Byzantine Forum”:
http://www.byzcath.org/forums/ubbthreads.php/topics/410745/Re:_St._Gregory_of_Narek_-_Doc
“A friend has sent me a convincing explanation.
When a church enters communion with Rome, as did part of the Armenian church, the Holy See accepts as valid all of its spiritual and theological patrimony, including canonizations, so long as there is no explicit contradiction with Catholic doctrine.”
This is what happened when the Armenian Catholic Church was formed, regarding St. Gregory and his work.
It would also explain the other cases mentioned in this thread.
“Also, it appears, St. Gregory was persecuted in life for defending the Council of Chalcedon, which would also count in his favour.
It sounds convincing to me! Any one disagree?”
“It is probably highly unlikely that St Gregory of Narek defended the Council of Chalcedon - possible, but highly improbable.”