Hate to break this news to the OP, but processionals in the NBA have been employing psychiatrists and psychologists for the evaluation of draft picks since probably the cocaine era 70's. The analysis by DX seems right on and gives some nameclature to the various percentages given to each specific group.
I am not someone who has been in the sports world but having been someone in a hiring capacity at a workplace, I get what they are referring to and often have looked for certain personality traits and stayed away from others when coming to a decision to hire a person. The success of many positions in business can be directly linked to personality traits. The NBA has known about this for decades.
Heck, look back at our Celtic history. Why was Auerbach so great in so many ways? He could read the players personalities and treated each in a way that most positively impacted the team personality as a whole, which is whatAuerbach strove to manage, the team personality. Its no secret he treated Russell different than any other player. That personality trait that he and Jordan and Bird and Kobe has almost demands that you treat that player special to mmaximize their capabilities. The tough blue collar guys were guys you drove into the ground and rewarded with time in role positions because that maximized their capabilities. Inward guys you had to draw out. Outward guys you had to reign in. Auerbach was teaching this stuff to Russell in the 50s and 60s and Heinsohn and Bird in the 70s and 80s.
Is it any wonder that someone asked if this came from Danny Ainge's desk. Because if Ainge is anything, its an Auerbachian disciple.