If you want Christological reflection, you’re now beginning to ask for a commentary, not a summary. And the book could easily generate many times its volume in commentary text.
The book certainly hints at the theme of the innocent suffering. But this never happens without a reason. In Job’s case, the immediate reason was that God would show the devil that Job’s faith was up to the challenge. Job’s suffering worked nobody’s salvation. In Jesus’ case, the reason was so that he could be the saving hero, bearing the burden of sin that we Christians couldn’t.
I gave an accurate summary: Job is innocent. His friends’ theology requires that his suffering be punishment for sin. He protests that it is not, begs God to explain himself. He refuses to blame God, judge God. The final faith affirmation ties suffering to redemption.
To say that it only hints at innocent suffering is to miss the main point of the book. If Job were guilty rather than innocent, he’d have his answer. Precisely because he’s righteous, yet suffering, is the central issue, not merely a hint.
Did you read the same book I read?
When combined with Isaiah 53 it is an important part of the OT preparation for the Christian message of redemptive suffering.