Speculation, mostly. The series has already deviated far enough from the book as to be almost a parallel universe. I only mention Nguyen because he's Erinwright's pet war hawk and they've already escalated things by shooting down Mars' black ops ship, so the next logical step is for Erinwright to send the fleet in to try and snatch Ganymede out of Mars' hands.Are these spoilers from the book?
And the monster fight in the Roci is hardly a spoiler at this point; I didn't even think they'd actually DO it until I saw the exterior view with the cargo door torn open.