It makes no sense to me either with these many 1/2 position players (Belinelli, DeColo, Ginobili, Green, Joseph, Mills, Parker and now, supposedly, Neal). A sign and trade has to be in the works as the Spurs, in the past, have always seemed to keep that one roster slot open as a last resort. If they have all 15 active roster spots filled with signed players, there seems to be no initiative for summer league/training camp extras to fight for the team, only hope that another team happens to be scouting them.
I'm great at multi-tasking -- I can waste time, be unproductive, and procrastinate all at once. Ain't life grand!!