The author was not denigrating "brilliant" men; instead he was explaining a type of "brilliant" person that focuses their energy on coming up with brilliant ideas, but will not stay focused long enough to see it through to finish. Imagine if you are reliant on a co-founder who wants to be pivot every 6 months simply because all of the challenges of the first brilliant idea are solved, and all that remains is the hard work and execution?
The outcome of that scenario would likely be the outcome he experienced in his first business venture with his college friend, "[Carroll] is a bad employer for himself, but he could put a lot of ginger into somebody else's business. . ."
>careful, detail-oriented and have good business sense and skills.
He was referring to the brilliant man who dress flashy, go to the hottest clubs, befriend people in higher stature, and dont really contribute to goals. They just have flashy ideas and move on to the next without realizing the goals of the first idea.
I'm category (a): creative, prone to mood swings, basically reliable but bad at the superficial reliability contests that determine advancement in most organizations. Yes, someone like me can be detail-oriented and show business acumen. We can be reliable. We're just not as competitive at being reliable (especially in the superficial ways, which are important in customer service) as others. If you need +3 sigma reliability-- someone who can work 100-hour weeks and not miss details or break rules or even become annoying-- you don't want +3 sigma creativity.
(I'm aware enough of the rough technical definition, I mean in the sense that if you think there are 500,000 super special people in the U.S. can you do anything useful to find them?)
My point is that there's a strong negative correlation, especially at the competitive upper reaches, between creativity and the sort os superficial reliability that (a) tends to determine a person's ability to advance in organizations, and (b) you'd probably want in someone you put in front of difficult clients on a regular basis.