Bob, I've had my DNA tested, but through a group affiliated with the Univ. of Arizona. The results indicate that I descend from Archibald Alexander, b. 1708, Cty. Donegal, Ire. Unfortunately, some folks who have their DNA tested expect it to take the place of "paper trail" research. Therein lies the rub--I've yet to find anyone who has hard evidence that William "the corpulent" died in Va., or ever came to America with his sons. Most of those who claim that he did have this William confused with others (and there are many).
In the books that I've researched regarding this line, there's never a mention that William actually came to America. All of these books are curiously silent as to what became of William.