Well there are six quarks. By a variant of the one-electron universe theory, we might argue that all quarks are shared instances of the same prototypical quark

Well there are six quarks. By a variant of the one-electron universe theory, we might argue that all quarks are shared instances of the same prototypical quark of that class. If we begin counting with 0, that's "5" quarks. So the answer is maybe: this universe is what you get! (Please don't take this seriously.)