I don't think they need another star in their line up ...
you are wrong if you think Derrick Rose is still a star.
he is no star anymore, if he'll ever play with the Lakers, he'll be in the 2nd unit, and my definition of a star belongs to the starter of a team.
He is still deadly in his part. He plays better offense so for me he is still a star he might not be suited to be teamed up with James. Rose played well with the ball in his hand and not by just receiving it and shoot which the Lakers doesn't need. Lakers need a streaky shooter to open up the lanes of Davis and the other bigmen to operate.