"I was destined to become CEO from CTO but decided COO and second in command is the best position for me."

I have a very good friend made exactly the same call. He just didn't feel he had the people skills to be the head guy...and given his slightly Aspergerish personality, he was right. So he now happily runs the company from the office of COO, as an absolutely brilliant technician, with a CEO who's smart enough to let him do so.