I like the thought process here, but I think it becomes far less baffling when you consider that Disney has more or less thrown thematic consistency out of the window, hence California Adventure becoming a Pixar park. For that reason, putting Moana into the dead center of Epcot for no particular reason lines up with their recent vision and thus makes perfect sense.
I'm hardly a thematic purist myself, but the placement of this whole thing does raise my eyebrow slightly.