Q. Why did God ignore Elihu in book of Job?

It appears that scholars suggest that Elihu's speeches were added after the original text was created as he does not appear in the epilogue or the previous verses. Elihu only appears in Job chapters 32-37 to deliver his three speeches.

"One of Job's friends. Elihu, the son of Barachel the Buzite, sat and listened while Job's three friends argued with him. When they fell silent he made three long speeches which covered much the same ground as the others. He too expressed the view that God did not punish good men, only bad ones. If only Job would repent of his sins, God would forgive him. Elihu suggested Job should say to the Lord, ‘I have borne chastisement; I will not offend any more; teach me what I do not see; if I have done iniquity, I will do it no more.’ (Job 34:31; Job 34:32) To the end Job maintained his innocence and demanded a fair trial with the charges against him presented in due form of law.Elihu is not mentioned in the epilogue or elsewhere in the text and scholars suggest that the Elihu chapters were not part of the original work, but were inserted at a later date by another author"-

Elihu. (2002). In Who's who in the old testament, Routledge. Retrieved from http://public.credoreference.com/content/entry/routwwot/elihu/0 ; please see attached file.