CRO has availablity at
DVC resorts from three sources.
1). DVD has retained 2-4% of the rooms at every DVC resort. These rooms are used to replace inventory when rooms are being renovated/repaired, but any excess may be rented thru CRO.
2). DVC members make a great number of rooms available when we use points for non-DVC options like the
Disney Cruise, Concierge Collection, Adventurer Collection and stays at other Disney Resorts. This is the greatest source of DVC availability for CRO. These rooms may not be reserved using points since the room has already been reserved using points and is now offered only for cash to pay for the non-DVC option.
3). 60 days ahead, any rooms unreserved using points are made available to CRO for cash rental. These rooms are also available to MS for point reservations.
There are many situations where DVC rooms are available for cash reservations, but there is no availability thru MS on points. Sounds like you've discovered one of those instances.
Good luck with the wait list!