I must confess I'm having trouble with that flowchart, specifically the first question about whether a moral judgment expresses a belief, and emotivism being on the "no" side. Doesn't, "Ew, murder" express the belief that murder is icky?

To put it another way, I'm having trouble reconciling the map of what people argue about the nature of morality, with what I know of how at least my brain processes moral belief and judgment.

That is, ISTM that moral judgments at the level where emotion and motivation are expressed do not carry any factual grounding, and they motivate action or express what people "should" or "should not" do. I'm having trouble seeing how this doesn't merge both branches of your diagram.

Of course, if the diagram is merely to illustrate what a bunch of people believe, then my immediate impression is that both groups are (partially) wrong. ;-)

(Another possibility, of course, is that these people are arguing about mind projections rather than what is actually happening in brains.)