Yeah you sorta get the idea.
Also don't forget that Marianne's like 16 feet tall or something. This sort of "eating half of a ship's crew at once" thing is basically like what she'd do all the time if she didn't have Jane around to keep her from overglutting herself all the time. Can't swordfight too well when you get to the point of those little pesky navy people able to hide underneath your belly, can you?
Commissioned a little bit ago from glitch- :3