Ability to book at grand Californian is luck of the draw. It's not at all a guaranteed or expected component of your
DVC membership, unless you own at VGC and book there before seven months. That said, I've done it in June for a straight week (last year) so it can be done.
It is a very small DVC and it's the only thing DVC at
disneyland. So you may not be able to book there. I wouldn't consider it realistic to plan for that specific resort at seven months consistently. Same for Aulani, and for some locations and room types at various times of the year in Florida. Some report wait list success at VGC. Many do not.
The problem is that there's no way to know if you're first on the list or five hundredth...which is natural as wait lists vary in dates and length overlapping your list. "Disappointed" would be reasonable. "Unsettled" is not.
If you were a direct purchaser who was "sold a bill of goods" on this by a DVC salesperson, welcome to the reality sans pixie dust of DVC. And make no mistake, I really hope the wait list comes through for you. But book a cash back up reservation for the dates you don't have covered. Hope is not a strategy...
ETA- reviewed your prior posts and I see you've been a member for several years. So you likely were aware of the above. I will leave it as-is, for readers that don't know this data already. But I still send you good wishes on your wait list. And I still would be moderately pessimistic on it coming through for this specific resort.