[deltasquared]

Something sounds off here.

At face value the article is saying. If most people are "ambiverts" and ambiverts make the best sales people, and sales people are the best leaders, why are there not more leaders? Why is it that most people are not in charge.

Finding out that there is no correlation between extroversion and sales performance is interesting and all but I think it would be better to find a new scale to use, one with positive correlation for what you are looking for.

Pointing out that people's scores for extroversion fall along a normal distribution, and that people's sales preform aces fall along a normal distribution does not really say much.

Typically, a low correlation score means your model is wrong, not that you need to fix your model by choosing a different locus.