I think it's too psyche-oriented. Trying to psycho-analyze the candidates? Trying to find a person from whom you can get the maximum benefit?
I've always had the feeling that people who are very interested in psychology are really trying to gain an edge over the others who they now "understand better" than the person him or herself.
Think of playing poker. If you understand your opponents it will give you a a benefit. And it's an interesting exercise. But on the other hand you could spend more time mastering the probabilities and counting cards, and gain an advantage by simply being a better player yourself.