And if the savant kid happened to only see a musical instrument for the first time at 10 years old, so that when they took their music entrance exams at 11 years old their performance was very good but not quite at the same level as the other kids who had been learning for 10 years, you would just want to assess all of them on performance at that moment, and choose the kids that had been playing longer because your objective assessment is that they are better musicians.