like Elijah = John the Baptist, preparing the way for the LORD, turning the hearts of the children towards their Father?
There's a difference between preparing the reader stylistically, and preparing the way as John he Baptist did.
If you truly don't see Elihu's posturing and statements about himself as troubling then there's no reason for you to find fault with him.
Yet as I've repeatedly stated, and you didn't once address, the structuring of the poem and the manner in which the 3 friends accuse Job serve as a model of an ANE trial with Job's declaration at the end requiring that only the aggrieved could stand in defense/accusation meaning it was purely God's place to answer. Yet Elihu steps in full of anger, a trait that the cultural setting would have primed the audience to view as a negative character, and levels Job.
We cannot take the silence as either commendation nor reprimand, it is simply silence. If you truly see no issues with Elihu and see everything he stated as positive I see no reason to dissuade you, though I don't think you're getting a full understanding of the poem without such a recognition.