And those epistles were addressed to besides Rome were Philippi, Colossae, Ephesus, Galatia, Thessalonica, Corinth, and people like Timothy, Titus and Philemon.
Additionally, in the book of Revelation, there is zero mention of Rome by Jesus to John.
SO where does Rome get off claiming to be the OTC?
Why not one of the others?
It's only presumption on the part of the RCC that it's then who Jesus was referring to. Rome was only one of seven cities that Paul wrote his epistles to.