I'm not sure that James, the brother of Jesus, would have done a better job at preserving the original teachings than the Christians did. We simply have no scriptures that could have shown that.
So this parallel is based on too little.
…..
What I was alluding to was the Jewish Christians or "Judaizers" as they were called by more Hellenized Christians of the time were caught between the Jewish hierarchy and the more Hellenized Christians who spoke Greek. The earlier Aramaic speaking Christians were lost.. Early Christian writers realized this:
"According to
Josephus James was stoned to death by
Ananus ben Ananus.
[75]
"
Clement of Alexandria relates that "James was thrown from the pinnacle of the temple, and was beaten to death with a club".
[68]
"
Hegesippus cites that "the Scribes and Pharisees placed James upon the pinnacle of the temple, and threw down the just man, and they began to stone him, for he was not killed by the fall. And one of them, who was a fuller, took the club with which he beat out clothes and struck the just man on the head".
[68]
James, brother of Jesus - Wikipedia
James had been the head of the Church of Jerusalem and recognized by Paul who met with him.
In time after the fall of Jerusalem and the diaspora a good many of the earlier Jewish for of Christianity was lost or suppressed in my view.
In the case of the Baha'i Faith the authorized text and succession was followed. We don't say the disciples buried Jesus and no one knows for sure as the remains of Jesus were supposed to be in the custody of Nicodemus and Joseph of Arimathea who were "secret" disciples.
There are by the way some interesting parallels between the martyr of the Bab and the crucifixion.
See:
Martyrdom of the Bab
I also wish to clarify how Baha'u'llah is seen as "the Father" it is closer to the idea that as a Manifestation He reflected the attributes of God in fulfillment of prophecy:
"For the Son of man shall come in the glory of his Father with his angels; and then he shall reward every man according to his works."
~ Matthew 16:27 KJV
"Now as regards the signs that would herald the advent of the new Manifestation. The Guardian wishes you to read over very carefully Bahá'u'lláh's explanation as recorded in the Íqán'. There it is made clear that what is meant by the appearance of the Son of God after the calamitous events preceding His coming is the revelation of His full glory and its recognition and acceptance by the peoples of the world, and not his physical appearance. For Bahá'u'lláh, Whose advent marks the return of the Son in the Glory of the Father, has already appeared, and the signs predicted in the Gospel have not yet fully been realized. Their complete fulfilment, however, would mark the beginning of the recognition of His full station by the peoples of the world, Then and only then will His appearance be made completely manifest."
(From a letter written on behalf of the Guardian to an individual believer, November 29, 1937)
(Compilations, Lights of Guidance, p. 492)