If you are good enough from early age to be a short stop, and you don't actually spend the time playing around in the OF also, you will miss that development. It's odd, there is a hierarchy of difficulty in playing the positions around the diamond, but just because you can play a harder one doesn't necessarily mean you can play an easier one, sometimes there is just a hole in your skill set when you reach adulthood, and some skills are harder to develop as an adult. So on one side you have Robin Yount or even Don Kelly who could play anywhere well. OTOH, Schoop is a very good 2b. 1b is 'easier' to play but he is a terrible 1b. Now I would say that since it's mostly footwork, given the time, Schoop has a much higher chance of becoming a good 1b than Willi has of becoming a good OF.