Pretty much every Spurs prospect come to SA at some point every off-season. Hanga and Bertans have been each of the last four years. Richards used to come before he and the team seemingly had a fall out. LJC was in Vegas last off-season, even though he didn't play in the summer league. Dangubic was in SA last off-season, and I'm sure he'll be in some time in during the summer (probably when he gets cut from the national team). The Spurs have practices and meetings with them to come up with a gameplan for the following year. It's not a strange thing at all. In fact, if the Spurs decide to stash Milutinov, he and the Spurs have to sign a release so that he cap hold goes away. Makes sense to do that while he's in SA.