I hadn't heard about anyone having naturally occurring fourth and fifth fingers without the linkage. I do remember reading a story about a piano player who dev

I hadn't heard about anyone having naturally occurring fourth and fifth fingers without the linkage. I do remember reading a story about a piano player who devised a set of stretches intended to develop the independence of his ring fingers but it ended up damaging the (tendons|ligaments|<insert medical term here>) and he could no longer effectively play the piano.