I spoke to a VC and they indicated that SW FL resorts get added to inventory by individual room number. It is the only way for them to keep the units and blocks of inventory straight. That is why sometimes you see a whole bunch of rooms types and sometimes you seen 1. If the room type has no inventory it just displays a single room type.
I have seen behavior like this, but I can't really verify what I was told.
Bay Club has a number as part of the room type, but that situation actually indicates a check in day and not a unit number, which is why I was skeptical of this explanation. But that is all I have and can't prove any of it. LOL