"this chapter is the vision of Gehenna" meaning one of the possible versions.
How is Caine describeb in the other possible endings? Because the Gehenna novel shows a completely different version of Caine AFAIR...
Roguey gib info.
In Fair Is Foul, which is Lilith vs Caine, he's a loser who sleeps most of the time, periodically wakes up to
at what society's become, and lets you kill him in the end (unless Luci gets him to repent)
In Nightshade, which is vamps vs antediluvians, he's already dead and the only thing that remains of him is a vial of blood.
In The Crucible of God, which is Antedilvuians take over the world (until they all die), Caine isn't mentioned at all until an optional stinger at the end. It's the worst campaign by far, with lack of player choice and a lot of apocalypse-porn-infodumping by a wannabe novelist.
Regardless, a common theme among these White Wolf-sanctioned scenarios is that Caine is a self-obsessed loser who wants to die or is already dead. Not some master of manipulation chess master. After all, his origin story was that he killed his brother in a fit of jealous rage and couldn't come up with anything better than "I'm not my brother's keeper."