> 4. Some combination of the above theories. This gets my vote. I've met brilliant ADHD hacker-types, overall average normal folks, and drop-out homeless peopl

> 4. Some combination of the above theories. This gets my vote. I've met brilliant ADHD hacker-types, overall average normal folks, and drop-out homeless people. They all did poorly in school but the rest seems up in the air. I suspect there are several comorbid complementary/incompatible genetic mutations, which lead to above-average or below-average mental faculties, and a nurture component of learning how to effectively manage the condition. We're probably observing evolution in action here.