Yes CFK! That's why I wrote:
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All of this really boils down to personality. You can have a highly MG (not HG) kid like mine who is climbing the walls w/ under-nourishment. WHereas, you can have a PG+ kid, completely content to doodle all day, sneak books into class, challenge himself by making up his own math word problems and working them in his head and is excited by the social opportunities school affords. It's a difference in personality.

CFK wrote;
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For him, not working to his challenge level ALL the time is torture. The harder it is the happier he is. Boredom and repetition are 4 letter words. They are physically painful for him. Not working to his challenge level would have had disastrous consequences.

Yes my son is like this. I'm trying to work on changing his perception but it has been difficult. If I had two kids like him, I"d give up. My 5yr old is like your other son. He's very easy-going, goes with the flow.