[AlexanderHowl]

IRL, genetics does not give people a floor in capabilities. Depending on education, environment, experiences, etc., genetics gives a probabilistic average of capabilities, but people can range easily to 20% below to 20% above this average without any major anomalies in their life. For example, a stroke in adulthood can cause to become a savant in a specific area after healing (or, more likely, leave them a vegetable).