It makes you wonder about the process of learning.
I'm learning to play guitar and there is an incremental development of skills, such that what was once a big conscious effort becomes effortless and subconscious. Then your mind can focus on the next area that needs improvement. Yesterday I played through Metallica - Enter Sandman at my guitar lesson and played it near perfect on the first attempt (after a week of at home practice). I couldn't have done that 3 months ago. The music just came out with little effort, and the couple of small mistakes I made were because I had misread the manuscript.
How does the savant, in many cases, appear to bypass the learning process and go straight to expert? I can sort of see how that can happen with mathematical skills which are "all in the mind", but what about the pianist? Fine motor skills and muscle development are important there - how can that come out of nowhere?