There is not disagreement that there is a link between what is going on in the troposphere and the stratosphere, and that it likely involves wave reflection, but rather what causes what. This is a subtle but maybe important distinction that we feel is not clearly resolved yet in research on the topic. For example, decades of research involving carefully designed model experiments has gone into showing how a weak or strong polar vortex influences weather patterns, and that this influence is real and causal (though perhaps small on average relative to internal tropospheric variability). While we know of a handful of these types of carefully designed experiments that have been done for this wave reflection type of coupling, there seems to be less consensus about whether it's the wave reflection off the polar vortex, and not corresponding and simultaneous tropospheric weather patterns, that is actually causing the cold weather. We do want to emphasize that we think research in this area is important and with continued studies, we can learn more about this linkage and its causality.