I don't know about the Seaborn and John Carroll connection. I have seen a Seaborn and William Carroll connection out of Johnston Co. NC.
Richard Bryant Carroll was the son of Seaborn and Chassie Carroll. His brother James R. Carroll was the father of Sarah Ella Carroll who was the mother of Daniel Elemuel Prewitt Nix (my husband's great grandfather). This makes James my husband's GGG grandfather and your gg grandfather...brothers. How did you get the parent information for Seaborn? Just curious. I saw it noted on familysearch.org and on another posting for the Carroll tree.