I am a descendant of James Monroe Gibbs, Sr., b: 1816 in North Carolina. I have a public tree posted on Ancestry that is far from complete but might help you. It appears to me that the very kind person who did all the research for you is correct once you get to William Gibbs (I don't know anything about William's family). FYI, James Needham Gibbs, my g-grandfather, and his family settled in Shreveport in the Cedar Grove area after leaving Pleasant Hill, so there were other Gibbs members in Shreveport as well.