Thanks, Shelley. I appreciate the suggestions. My starting point in trying to identify this particular John Moore is whether he married Mary 'Polly' TATE d/o Capt. James TATE and Sarah HALL. Mary was b. 4 Oct 1774 in Augusta Co, VA. Several sources said she married "John Moore" and there is a marriage record dated 26 Sep 1808 in Green Co., KY for John Moore and Polly Tate which may or may not be them.
All very circumstantial, I know. Since this isn't my main line, I probably won't spend much more time on trying to confirm this marriage. I'm on the West Coast and don't have access to records from VA and KY in my area.
If you find something in your spreadsheet to shed light on this couple, please let me know