I've been thinking a lot about clock guy's significance, and IMO he's gonna be the main character, regardless of Gabriel being the chosen one.
I think it's not a coincidence that he's being revealed last, and I also think he will be the "silent character" (that has no singing role).
If he's indeed a child, that would make him the only child in the story (which we hadn't thought what meaning it would have). Also, it's pretty common in literature and poetry to use a child as "the voice of innocence and reason", so that would make him a decent option as the character who can end the dispute between the GNE and RRM.
Maybe hadi was right to be obsessed with the clock guy