The thing I see as my number one when looking at leaders is the common sense of that person. Do they have enough brains to know they need a good solid core of advisors and not just surround themselves with yes men.
This is important for sure - "wisdom" - knowing when to use what one has. I think this is one of the skills. IQ is not a great indicator of this, neither are people skills - it is another set, but kind of a bridge for all skills.
Being a leader in one place, one location, one time, does not necessarily make a person a leader in another area, in another time and place.
Exactly - There is a time and a place for different kinds of leaders. Horses for courses, so to speak.