>>7405957Kiara is autistic and can achieve great things if she singularly focusses on it (e.g. brute-forcing learning Japanese in a ridiculously short time), but lacking that drive, she lags behind considerably.
Ollie does have the same autistic focus if she cares, but as hard as she might try, she still fails. See her forays into chess. Though I suppose she's better at math.
By comparison, the likes of Botan or Suisei are conventionally driven and intelligent. They don't have the excessive specialisation, but they're pretty good across the board.