OK, let's run with the assumption that Peter was chosen. Now explain all the rest that is this giant inverted pyramid of Papal dogma (succession, infallibility, etc.) that's teetering on these two verses.
I must say I kinda get a kick out of this one. Where does the proposition that if Christ's words don't span more than 2 verses, they are somehow suspect or discountable come from? (Especially since "verses" are the invention of German printers...)