Brains, Brains, Brains, Brains: different flavors of genius
scienceblogs.com
scienceblogs.com
Imho, the "dots and spaces" metaphor is still the best one to describe the diversity of brilliance around us: http://www.stephanietolan.com/self-knowledge.htm
You did refute his actual point, though.
The problem is, if you abstract any amazing person into one word, it is usually "genius." Which elicits the natural tendency to find patterns and make comparisons (since we are comparing "apples" to "apples" now, aren't we!?). Amongst the different flavors of humans, there is a common flavor of romanticism and bias.