I think it's mostly a function of how small the building is.
According to the numbers I was given only about 22 of the 50 units will be lockoffs. That means only 22 Studios and 22 One Bedrooms maximum.
Even if owners only book the resort to 50% occupancy during their priority period (perhaps a conservative estimate), that leaves only 11 Studios and 11 One Bedrooms to be booked by non-owners at 7 months. With 350,000 - 400,000 members potentially wanting to book VGC at 7 months, the low number of remaining vacancies could be snatched up quickly at 7 months.
There certainly will be successful bookings at 7 months...just like there are for every other resort. But since VGC has the smallest number of units (by a wide margin) it is also likely to have the lowest success rate at 7 months.
As you say, the volume of home bookings will play a big role. If owners only book to 30% occupancy that leaves about 15 Studio villas at 7 months. But if owners book to 60% occupancy, that's only about 8 Studios for non-owners. Of course, that number is likely to fluctuate throughout the year with the high-demand periods being nearly impossible to get at 7 mos.
) and reading what others are seeing and reporting! 
