I will summarize his responses as follows:
He told me that even though to many it may not appear to be so, but NBA basketball is extremely intentional. Any game is the result of a huge amount of practice. No one just runs around aimlessly. Even the free-styling, he said, is based on practice and variations of plays when the plays have broken down or an opportunity emerges during the course of running a play. In short, everything in NBA basketball is intentional. Of course, plays breakdown and many times you just have to create something. Yet, it is rare for a possession to start without some sort of intention.
He said playcalling varies by teams. Yet, from his time in the league and his interaction with players - from superstars to benchwarmers - playcalling is a significant part of the game. However, he stressed that when a play is not called - that doesn't mean what is happening is not intentional. It may be, for example, that an opportunity develops - such as a mismatch that leads to a great give-and-go situation or another quick series of steps that they have - you guessed it - practiced over and over again. They even practice what to do in situations where a play breaks down or there is no time and something has to happen fast. It may not be a play, but it is intentional.
He also stated that in the NBA, you are dealing with coaches and high caliber players that study you and what you do. Then after studying you and what you do, they - you guessed it - practice on how to stop it or exploit it. If you don't plan or approach the game from an intentional perspective, then you will not succeed at all.
He also indicated, as you might have figured out by now, that practice, game film and learning your teammates are where everything starts.
Finally, one thing he mentioned is that the game is incredibly fast and mental. He said more than people realize it is really a chess match. That's why practice is so important. The caliber of athlete in the NBA - or any professional sport - is routinely underestimated.
At any rate, I just thought I'd share that discussion. I thought it was informative. He went into a lot more technical information and examples about basketball but, I'm just not up to that level of understanding of the game. I just thought I'd share it.
Now, I'm off to practice on 2k11 so I can become better at it.
Any thoughts?

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