Would he be able to tell if it's worth investing time into, even if not exactly why or how? Like it seems malicious (ghost or otherwise) or worth paying attention to because for some other reason that may cause danger for the group they weren't aware of (even if Raven can't/won't say topic specifics other than get your ass in gear with your new friends, Gil).

...or, you know, if it's just a drunk guy who drowned himself that happened to just be near that mirror on the ship, too, and Gil, just let this guy rest in peace and go back to your waiting cat-friend.