Unless you're a DVC member and BWV is your home resort, you're going to have a really tough time getting a grand villa there. There are very few of them, and members snap them up at the 11-month window. I'd be very surprised if any were available for cash bookings by non-members.
If you want to get a GV and you're willing to rent a reservation from a DVC member, you'd need to find a BWV owner, and make arrangements for them to book it 11 months before your trip.