RJ Barrett Rebounds Prop is currently Over/Under 4.5 (-130/-105).
The money has been on the Under as it opened 4.5 @ -105 before it was bet down to 4.5 @ -105.
FACTORS THAT FAVOR THE OVER:
The Raptors rank as the 7th-best offensive rebounding offense in the NBA over the last 15 games (offensive rebounds maintain possession and may therefore create new opportunities for scoring and assists).