I too and trying to narrow down information on John Hunter. There are several points that time John to George. I have found references to Captain George Hunter and similar references to John G Hunter. Eliza Jane is my Great Grandmother and I have posted a picture of her on my tree. Eliza Jane was a daughter of "John" Hunter. I found George Hunter and the Sisk familys all on the same census and correct dates. It is worth digging deeper into the name.
I am open to sharing whatever we find to determine the lineage.