And he alleges that also there is a female with him, whose measurement, he says, is according to the standards already mentioned. And he asserts that the male (angel) is Son of God, but that the female is called Holy Spirit.
http://www.newadvent.org/fathers/050109.htm
If Galatians was used against Elchasaites (dr. Detering thinks that Galatians was even fabricated against them) then, to contrast the cosmic sister of Jesus by a human brother of Jesus, the interpolator called James "the brother of Lord".