You can see the response HERE. As I anticipated, McCarn is a reasonable man and open to refining his views when necessary. While we may not see eye to eye on everything, the following common ground is sufficient for now. In his response, he says:
"By overemphasizing physical descent I have obscured two important points...the nation includes many who likely have no physical descent from any of the Twelve Tribes, and for that reason the primary criterion for inclusion in the nation is covenantal."Good, productive conversation. Many thanks to McCarn for being open to an exchange of ideas!