You argument is tautological 'they cannot act average because they are exceptional'. You cannot separate one from the other -- either put an 'average' person in their position and judge how they react to it (in which case Magnus would be a good example), or say that people who are seen as exceptional could never have been 'average'.
It seems to me you are arguing for the latter, which makes your whole argument pointless. Am I mistaken?
EDIT -- To clarify: your argument is tautological because any example that is brought up will be someone who has become famous and idolized, and thus negated by your 'a normal person wouldn't act like that' retort. It is impossible to hold up a non-famous chess genius because we can't know who they are.
It seems to me you are arguing for the latter, which makes your whole argument pointless. Am I mistaken?
EDIT -- To clarify: your argument is tautological because any example that is brought up will be someone who has become famous and idolized, and thus negated by your 'a normal person wouldn't act like that' retort. It is impossible to hold up a non-famous chess genius because we can't know who they are.