M7y take would be that the "Church" doesn't interpret anything. The "Church" does not teach, although we say that a lot. PEOPLE interpret and teach. We simply believe in a hierarchical structure that keeps us all singing from the same page, to some extent. We don't just make it up as we go along. I think we say the "Church" because it's not just this Pope, but all the popes who establish the church's teachings. Moreover, it's not just the Pope, the Cardinals have huge input, and they, as well as all Archbishops and Bishops have significant power over their own Bishoprics.
That's what scary... now its PEOPLE who interpret and teach. Gee, I always thought it was the Word of God who taught via the holy spirit. Silly me?