I don't see being massively successful in the world of business requires less intelligence than someone who's massively successful in the world of academia...even if it's in oil, import/export or banking. These things are insanely complicated when you consider their magnitudes, scale and the cost of making mistakes.
Personality traits (based on the Big 5) can also confuse us when it comes to the judging of someone intelligence. He/She may strike us as very intelligent, when in fact, they simply are high on Agreeableness and Openness.
Someone with a very low score of Agreeableness may repel us (aka Steve Jobs) and we would tend to consider him less intelligent because of our aversion to his behaviors.
hmm, perhaps
I don't think I'm discounting jobs due to his personality; i'm not prone to mistaking affability or gregariousness for intellect.
Most of the very smart people I listed would likely score lower in agreeableness and openness than jobs.
I'm not convinced that running a country/multi billion dollar company requires the same level of intelligence as, say, inventing calculus or proving fermat's last theorem. nor are they similar levels of complexity. while its easy to say it's an apples/oranges case, I don't really think they're in the same tier.