Thanks for the response my friend, I have a GEDmatch account, but not very good with using it.
The autosomal DNA matches that I have with Nicholas Gassaway [gassaway-128] are through Ancestry, their platform called "Thru Lines".
This DNA connection and circumstancial evidence makes me believe that Nicholas Gassaway (128) and one of his 3 wives is my ancestor.
Robert Gassaway, Nicholas Gassaway's son, was in the same military unit, Capt. Vallentine Creager Co, April 1776, as my Lawrence Stull, the future husband of Rebecca Gassaway, although my Lawrence served in the company in October 1776 and presumably went to fight in White Plains.
And as I mentioned above, Robert Gassaway witness the wedding between Lawerence and Rebecca May 1778, 2 years later.
Of note, my Lawrence Stull and Rebecca had 8 kids and moved from Frederick Co, MD to Hopkins Co, KY and then to Posey Co, IL. One son was Nicholas Stull, and another was Gassaway Stull.
Any help or insight would be greatly appreciated. Blessings, Nate