Was William one of the six Brothers?

I found three records of people searching for William McCown, b. 1708, in Antrim, died 1747 in
Knockmaokigan, Fermanagh on Ancestry.com.  It says that his father was Alexander McCoun who
according to what I have read elsewhere, was a Presbyterian minister and immigrated from Antrim
about 1715 and setteled with his six sons in Pennsylvania.  If this is the same Alexander, then I know by DNA results that they are not in my line.  The searches were done by people trying to fill in family trees other than McCown trees.

I find a potential ancestor and then only two weeks later have my hopes dashed.  Such is life!