I know Duncan wears 21 because it's the number his brother-in-law wore when he (his brother-in-law) played in college.
His brother-in-law taught him the game after his mother died. Worked with him for hours a day. He had no idea how tall Duncan would be and he taught him a lot of ball handling, point guard skills.
Duncan wore 21 in college and kept it when he joined the league.

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