Originally Posted by
platbrownguy
There's a risk that if you have an equipment swap or something the day of travel, the family of 4 will be reassigned to non-MCE seats and the platinum+spouse will be in MCE (or will have to fight for MCE). Saying the reservations were "linked" to a gate agent dealing with an equipment swap is unlikely to help anything, just from personal experience.
just make sure that all seats exists in the event of likely swap. Like 737 to oasis or 788 to 788 retrofit.