How confident can we be that only a single breed other than the Dom American Game and breed x were involved? Also, a couple other breeds may have been around that could have had more influence than Dom American Games. Multiple parts of Europe had dom colored landraces (i.e. Scots Gray) that could have been involved. The Scott's Gray was valued for eggs and meat, existed at the correct time (pre-dating American Dominique) and occurred in a region providing immigrants to the eastern seaboard at the correct time.