Zoning maps often have a Current, and Future zoning class. Also, zoning is designed to be changed when it benefits the community, and as patterns/times/demands change. It's not written in stone.
The rezoning meetings are designed to bring local input, before they vote on it. Likely if they are even scheduling a rezoning meeting, they have atleast a weak commitment from the BoCC to consider the rezoning.
Every rezoning meeting has some raving enviro nuts, that speak against everything, every time, anywhere in the county. Those people have a right to be heard, but they are generally ignored too. Try to set yourself apart from them. Most commissioners are fairly normal folks, but they are also generally leaders in community, business men, developers, ect. So, they are likely by default somewhat pro development, But they also can absolutely include requirements as a condition of rezoning to address local people affected by the rezoning. Thats you. It costs the commission nothing to require more buffers, roadway improvement, ect; as long as it doesn't make the development unfeasable. The developer needs to make money, and on 72 homes; they probably can spend a couple million to keep people happy, but not $15m.