i don't agree with your "completely separate body" opinion. communication between the two organs is going to be an issue; in order to avoid having a "left hand doesn't know what right hand does (decided, published, whatever...)" it is required to have exchange. the worst is to have each reading the meeting minutes of the other. the next best thing is a member of the other attending meetings; certainly an improvement, but this leaves the "exchange" limited to meetings. if one person is in both organs, the flow of information is optimal, as the person will always have the most recent status of both sides. in fact, if both are going to remain, maybe such a duality should be institutionalised?