Moses is very probably Buckley Walker's son. Here is what I know about him.
It is unproven but very certain that he was a son of Buckley. We know that he was born in Bedford County, Virginia on November 15, 1763. He served in the Revolution by making canteens (so did Buckley). John Murcheson mentions that he served in the Revolution as a substitute for Moses Walker in Bedford County. Moses migration is well documented in his Revolutionary War Pension Application. First he moved from Bedford, Virginia to Surry County, North Carolina around 1786 and lived there for 6 months. He is listed in the Surry County 1786 tax list in the same district with James and Jesse Walker. He then moved to Caswell County, NC and lived there one year. Then he moved to Halifax County, VA and married Isabell Irvine on 12/28/1789 and lived there until 1801 when they along with many of the Irvine family moved to Jessamine County, KY. Moses Walker named his son James Buckley Walker (b. October 24, 1790 in Halifax, VA). He died on 3/27/1848 and is buried beside his wife Isabell and his son James Buckley Walker on the Irvine Homestead on Pekin Lane of Harrodsburg Rd in Jessamine County. It doesn't appear unusual that he is not mentioned in any of his father's estate settlement or land transactions because he was living in Kentucky at the time of his father's death.