So the castle does in fact flood with water....
Anyways I think timeskip luffy is much more blunt witht the way he treats people. I can't wait to see how the sea forest thing unfolds. I bet luffy will wander around and not run into jimbei until he has already cross fists with hodi. I wonder why he's not supposed to fight him....maybe fishmen/mermen will have general contempt for humans as a whole seeing as how both of their iconic fishmen pirate leaders will have been defeated by luffy(moreso than normal ofcourse).