Jesus called Peter and unstable movable rock. He then distinctly said the ekklesia was to be built on unmovable bedrock rather than on that moveable unstable rock. And Peter surely did prove he was a movable unstable rock when he denied Christ three times.
Really...it's amazing how no one ever mentions that in the first century....nor the second...nor the tenth, nor the twelfth, I NEVER SAW IT MENTIONED IN THE SIXTEENTH, NOR THE NINTEENTH, but here in the twenty first, you bring it up as fact.....funny how important stuff like that is overlooked until you came along....simply amazing.