yet according to the CCC the whole episcopacy exercises the power of the keys which is given to THE CHURCH:
http://www.vatican.va/archive/catechism/p123a10.htm#II
Well taken.
Which is why it is so important that Catholics not get into this artificial disagreement of...who was given the authority? Was it the Pope? Was it the College of Bishops? Was it the Church?
All of them. Because all of them are meant to function as a single unit, not as institutions at loggerheads with one another.