We stayed at VWL in November. We had originally booked 11/27-11/30 with the member cash discount. We then found we could save $500 on air by leaving on Sat instead of Friday. I called MS and was able to book 11/30-12/1 on cash, but without the discount.
When we checked in, I told them about the additional night and they did make sure we would not have to move, however, I DID realize that was a possibility.
We had DDP for 11/27-11/30. We did NOT have the DDP for 11/30-12/1. Our reservations were not linked. I did have to go down and check in again.
If you split a stay between 2 diff resorts or 2 different categories of room (like the 2 and 1 br), you can have DDP for just one, since they are considered 2 separate reservations.
I do think, though, once you LINK the reservations, you must get DDP for the whole thing, for ex. our stay at OKW in May, we are doing points, cash for the w/e, then points. We have them all linked so we don't have to move. The DDP will be for the whole stay, I cannot have it for only the w/e without unlinking everything.
I think the way to see it is this: if you check out and then check back in, you have 2 separate reservations and can have the DDP for one and not the other. If you do NOT have to check in and out in the middle of the stay, even if you have more than 1 reservation number, then you would have to have DDP for all or nothing.