Given that the number of dead plays that Doc insists on running for Ray, I don't know why anyone should be surprised that Rondo may not care whether Ray comes back or not. From Rondo's perspective, Ray is the guy who makes him stand at the top of they key and dribble the ball for 18 seconds waiting for him to get open, then at least half the time Rondo's forced to manufacture offense on his own at the last second.
Mike