sounds like one of the "puzzles" from God of War II, which involved moving giant chains that were connected to the main "hub" closer
Could be, I wouldn't put it pass them to do something similar since well, it's already similar enough to God of War anyway.
On the otherhand, the revelation that the castle is alive and could be mobile if the chains were removed sounds interesting but I don't see Mercurysteam being
THAT ambitious.
Plus, being able to control the entire castle like a titanic fortress sounds stupid. I mean, who would enjoy something like that?