There is no doubt that Stephon Castle is an untouchable, foundational member of the Spurs' core going forward. Stephon Castle is currently in the 97th percentile of all players in the NBA in assist percentage. Stephon Castle has pristine court vision, a high basketball IQ, and the intangibles to run plays with anyone. Ever since then, Stephon Castle has been in go mode. The success of Stephon Castle so far is in large part due to Head Coach Mitch Johnson.