Your "facts" are not correct according to the application filed with the County.

The total application is for 242.37 acres. Not all of this land is in the Rural zone (a Dwelling Unit/5 acres density). Most of it is zoned Rural Agriculture at 1 Dwelling Unit/10 acres.

Rural zoned lands = 93.83 acres = 18 houses
Rural Ag zoned lands = 148.54 acres = 15 houses

So the total possible development without doing a Planned Residential Development = 33 houses, not the 50 you claim.
However, the number of houses could conceivably be doubled by doing a Planned Residential Development, but then the vast majority of the land would have to remain in open space (i.e., farm use).

One other thing. If I'm reading the maps correctly, this mega development will completely surround a 40 acre parcel of Commercial Agriculture zoned land. How long do you think farming on that land will last once its surrounded by urban development?