If that D.G. Simpson is the one that married Malisa Gooden, I don't believe he would have gone back to Tennessee. Because, his wife, Molisie and 2 sons are on the 1880 census of Oregon County Missouri. But I have not been able to locate David, Malisa and sons on the 1870 census. Though there is a David Simpson listed on the 1870 census in Cannon County, Tennessee, but two other families are claiming him as their David.