Thanks for the reply. I realize that John Clarke, Jr., had a daughter named Jane (who married Leonard Maxner) as well as a sister named Jane (called Jean in his will) who married John Neily.
Whether his father was the John Clarke of Cork who married Lydia Green or not is what I was questioning. It is a fairly common name, and if, as indicated by several sources, he was part of a McNutt settlement, it is much more likely that he was from the north of Ireland like almost all the other McNutt settlers. The Cork-Roscommon Clarkes also seem to have been Roman Catholics while the Windsor ones were Protestant. Do you have any evidence that the Windsor family came from Cork or that John, Jr.'s mother was Lydia?
Although Esther Clark Wright was a respected researcher, I have also found no evidence for her statement in Planters and Pioneers (p.81), that he was the "same as the Methodist lay preacher, from Yorkshire, at Amherst 1765, at Windsor, 1771".
As the island of knowledge grows, so does the shoreline of the unknown.