Cousins, Cozzens, Cossens in the Muscogee (Creek) Nation

A trader named Cossens was living among the Creeks in 1765 and I believe he was the father of my 5th Great Grandmother Mary Cousins Dyer who was a Mestizo, (mixed blood) who died in the Battle at Fort Mims, 1813.I haven't found much information on the Trader, and I hope some of you know of him. I believe some descendants of this man also married into the McIntosh (Creek) family.