If the Spurs would consider another D-league player...Stats from D-league:
Individual leaders by category

Double/Double leaders
http://www.nba.com/dleague/statistic...DD=All%20Teams

Block Leaders
http://www.nba.com/dleague/statistic...DD=All%20Teams

Rebound Leaders
http://www.nba.com/dleague/statistic...DD=All%20Teams