It depends on the ownership of the points. There are a number of point pools and how the rooms associated with those points get over to CRO to be available for cash.
When you book a room through RCI, Disney then sends a room equilvent over to RCI to book via an RCI trade - those rooms are now RCIs, if an RCI member books them, and usually they do, if they don't - they are no longer
DVC inventory.
Same with if you book something with the Disney collection. Disney gives CRO rooms in trade for your cruise - those rooms are now owned by CRO to try and sell for cash. If they sell them, they are occupied. If not, they can't come back to DVC because they don't belong to members. One of the reason the Disney collection is so expensive is that CRO won't have a 100% booking rate - but those points - and the room associated with them - has been used by a member.
DVD has some inventory they own. Foreclosures and inventory not yet sold. The inventory they haven't sold is what your guide MIGHT use to make some magic on your first booking - but again, members don't own the rooms nights associated with those points, DVD does and they use CRO to broker them to pay their portion of the dues on those points. They also have some maintenance inventory, but we can't access that, nor does CRO, its maintenance.
CRO will have rooms that DVC has turned over as unbooked inventory 60 days out - DVC tries to rent those for cash, and that helps our dues - that inventory is "shared"- DVC can pull it back if it doesn't get booked on cash.
The biggest mystery here is how DVC and CRO decide how to choose rooms and nights to trade over. No one really knows how that is done.