No understandable story like the story about the eye suggests itself. THAT's the problem. Probably not, though that story is not over yet. So far that's fine. Word order conventions are learnable.
All natural languages can say anything any other language can say.
So don't mix chimps and humans. And creole has full-blown UG, not part of it. Some grammatical rules are needed to use strings of symbols as propositions that can be true or false and that can be used to get and give the information we convey with sentences. Processing becomes quicker and more efficient. A concept cannot be true or false.