When I joined Pounding The Rock, I pitched a project that would cover every player who ever wore a Spurs jersey. Not equally, by any means, but each jersey would be identified numerically by the players who wore it.
There is a significance to the numbers of jerseys as it pertains to the five NBA Championships that have been won by the San Antonio Spurs.
There is only one jersey number associated with all five San Antonio Spurs NBA Championships- #21. Tim Duncan. He is coincidentally also the only player to be involved in all five titles.