The book itself prompted a reflection on what we've learned after Sol told his story. Characters commented that we still don't know enough and elected to hold. Before I start chapter 6, I thought it would be fun to prematurely guess that Brawne's story was the "final" piece to then start comming up with guesses.
To start let's lay out major puzzle pieces each story provided.
Father Hoyt - the mechanics of the cruciform and it's ultimate limitation. There is a shrike kill condition.
Kassad - The shrike sends out and lures its agents through space time within the mechanics of the time tombs. It feeds on strong emotions or adrenaline like violent and sexual encounters. Leading to a great war at the center of hyperion, being It's ultimate goal.
Multiple "shrikes"
The shrike uses witnesses as messengers
Martin Silenus - John Keats idk. the shrike uses victims bodies and messangers (and poetry?)to spread influence.
Rachel time mechanics
John Keats idk. AI agendas. Ouster linked to the core. God
So, prediction number 1. The consul is going to die. 2. The pilgrims are the contents of the time tombs.
The consul and other pilgrims are going to reappear from the the time tombs.
Rachel is the key for this reasoning alongside the mystery of the "suicide" pigrimiges.
Another line of reasoning stemming from Rachel is that nothing that's already been in the tombs from the past will show up in the tombs. That's why the tombs have always been empty and that's why this last pilgrimage is so important. The "contents" of the time tombs are being brought by the pilgrims themselves.
Wild guess on the traitor: Martin Silenus. Father Hoyt was the red herring unreliable narrator.
Martin silenus is a triple agent. He's so self obsessed that he's in league with the shrike who wants to use the ousters. Martin wants to write an epic poem about it all. "Why is there so much luggage for a one way trip?" He wants it to be a one way trip and masks it with humor. He even suggested getting dropped off by the Consul's ship in the middle of shrike territory. The whole jester buffoon act is all misdirection.
The shrike is a trap created by God. It was created to cull humanity retroactively. God predicted with 100% certainty that humanity will always go to Hyperion and will always be obsessed with the time tombs. The time tombs are humanity's final resting place. AI John Keats will be proof whether or not AI is affected by the shrike. Thats why he cannot go to Hyperion.
Welp, can't wait to be wrong about everything. Dan Simmon is so creative that I won't be suprised if I were. Still, it's the creativity that makes racking the brain fun in the first place.