A check of deeds recorded with the Orange County Comptroller for Bay Lake Tower would indicate that each "unit" is assigned a specific Use Year. A random check of deeds for units 25a, 26a, 26b, 34a, 36a, 82b, 87a, 87b, 88b, and 88c all show a February UY; all deeds for unit 82a have a March UY; all deeds for unit 82c have a June UY; and all deeds for unit 14b have a October UY.
The deeds also indicate that the total number of points in each unit varies. For example, unit 87a has about 34,976 points assigned to it, while unit 14b has about 19,637 points assigned to it.
As noted by the previous poster, this unscientific review of deeds show that points are tied to specific units, and each unit has a specific UY.