I am booked MCE with 3 members of my family on an upcoming roundtrip set of flights in late March. Seats have already been selected. If I split myself and one other passenger out to get on the upgrade list ("divorced" so two separate PNR for each of us, and another for the other two in the reservation) will the other three passengers who are not me lose their MCE seats/privileges? I am in particular concerned if they decide to make some small change to the flight time or even a change to a different type of plane that they may lose those seats but don't know if this concern is unfounded.