Rose is not scared of LeBron or any player in the league for that matter. If Rose was scared of anything it would have been reinjuring his ACL. No one really knows why Derrick Rose didn't return except himself ( most likely because he didn't want to reinjure his knee) and the people making up these rumors are either mad Bulls fans or immature NBA fans. He'll return at the beginning of the next NBA season (he'll play in the preseason).