"I would like to address the question of the Orthodox view of the validity of Catholic sacraments. The Orthodox hold that the Catholic Church is not validly a part of the Church of Christ and thus (for many Orthodox) is lacking in God' grace."
That, frankly, is news to me. It seems highly unlikely that the EP would address and speak about the Pope as "The Elder Brother at Rome" and "My Brother at Rome" and call the Roman Church the "Elder Church" or "sister church" if this were true.
Some jurisdictions have adopted a very narrow interpretation of the rule that the Mysteries do not exist outside the Church and firmly reject any grace in Roman Catholic and all other heterodox sacraments.It is also what I perceive from some Orthodox that post on here.