I'm rarely the smartest person in a room. In a given undergrad class of 30 people, there are probably 5 people who are considerably smarter than me, and another 10 who are about at my level. Then like 10 who were never taught a method of expression so it's a mystery.
But I *know* that I have a much more powerful imagination than most people. I've been using it, training it, alternating between sustainable and overclocking, using my environment as stimuli, since I was like 5 years old.