 Recall  (§3.2)  that Spekkens’ (2005) claim that no noncontextual ontological model can reproduce the observed statistics of quantum theory based on his principle of parsimony (that there can be no ontological difference without operational difference) was sidestepped by retrocausal approaches due to the explicit assumption of the ontological models framework that the ontic state is independent of the measurement procedure (i.e., that there is no retrocausality). It was noted there the possibility that Spekkens’ principle of parsimony might be recast to apply more generally to retrocausal models. Shrapnel and Costa (2018) achieve just this in a no-go theorem that applies to any exotic causal structure used to sidestep the ontological models framework, including retrocausal accounts, rendering such models contextual after all.