I think you can twist out of context, any document or writing that you wish, but the bottom line here, is that the Pope was NEVER anything other than “Primus Inter Pares”, a Chairman of the Board type that settled disputes on occasion. The Orthodox Church may concede that as Patriarch of the West, he may hold authority over his own sphere of influence, but he will NEVER...Let me repeat...NEVER be a Universal, Infallible Pope by Latin Definition, over the Eastern Orthodox Church.
My issue is the inaccurate (putting it very mildly) presentation of the patristic teaching in the encyclical you posted and not what you think will or will not happen as regards the papacy.