Volcano Bay needs to be listed separately (theme park or not) simply because it's location is counter intuitive to where the parking will be located. It's just like the people who pass the parking lot for Magic Kingdom because it's no where near the park itself. All day long people drive into the bus lanes in front of the Magic Kingdom trying to park, and I would guess it will be the same with people trying to Cabana Bay and Sapphire Falls figuring that's the parking for VB. Luckily the bulk of VB guests will be onsite guests in the hotels.