Stephon Castle's Under 4.5 rebounds aligns with the expected game script given his recent struggles and the matchup against a strong rebounding team in the Pistons. The evidence indicates he has averaged only 2.4 rebounds over his last five games and is likely to face limited opportunities as the Spurs may dominate the game, potentially impacting his minutes. The positive Net EV of 0.03 suggests there is a slight edge on this line, supported by the pro agent's factors that highlight his limited ability to gather rebounds in this matchup.