I found the below article interesting in that it essentially states Pop avoids American players. I had always thought of Pop being better at scouting international guys but hadn't thought about him purposefully avoiding Americans because of selfish play.
http://espn.go.com/nba/story/_/id/9364989/san-antonio-spurs-doing-right-drafting-international-athletes-espn-magazine
http://espn.go.com/nba/story/_/id/9364989/san-antonio-spurs-doing-right-drafting-international-athletes-espn-magazine