As for the Hutchins, I've seen references that Dr. Hartsfield's father was Abimileck (lots of spellings, just like lots of spellings for Hutchins)and his mother was Clarissa Hutchins. I don't have a proven source for that, but like it as a possible partial explanation of ownership from Hutchens to Hartsfield.
As to the land being part of a larger parcel or grant, I don't know. There are a few references to the adjoining land owners in the mid to late 1800s. If someone has researched this already, I hope they post their findings. If you'd like the sources of any of the material mentioned, just let me know.