Maybe it meant "Rocky" as Augustine said????
In any event it certainly is not a fact that Peter was the rock.
Well, there we have a problem. I've been doing little else but citing that Scriptural evidence. :)
If I cited Scriptural evidence that Jesus called Peter "Satan" in a much more direct manner than your "rock" evidence would you be ready to address Peter as Satan?
I am of course well aware of "Vade retro, Satanam!"---Get Thee behind me Satan! Simon was called Peter the rest of his life. He was called Satan once...and I think all of us once in a while--including Popes--deserve that admonition. :)