Dont know about Kuratowskis Ghost but I found Kenneth Humphreys presenting a good argument that part of the James passage is an interpolation  Even if Humphreys is wrong he does show that by reading the James passage in context that the Jesus Jesus the son of Damneus mentioned is not the Jesus Jesus son of Josheph of the Bible  So at best the James Passage only shows that there was another Jesus regarded as Christ who also had a brother named James who instead of being crucified was made High Priest