ENSO state is a major driver, so especially when it is clearly in a Nina or Nino phase(moderate to strong), there are established, reliable correlations that can be made about the general pattern. I cant see that suddenly "not working" anymore. Last winter the ENSO was warm neutral and the Pac SSTs were pretty warm everywhere. The winter before, the Nino was super weak and undefined, and there was little atmospheric response until very late. MJO can dominate under those conditions, and especially last winter we saw that, with the strong tropical convection persistently where we didn't want it.