Another thing worth mentioning is the current diversity these two, more specifically Ninetales, create in the builder. Rain and Sand which have been the superior weather archetypes for the last few generations always seemed to stick to a pretty standard shell. Every few months some innovation would occur but it would quickly become common place. However, Hail teams are so different from game to game it becomes a lot harder to game plan for them, since you wont be able to regularly preserve certain mons for specific match ups since you could play 3 games and each team will use a completely different method to wear down your answers to Arctozolt. This leading to an uptick in Arctozolt consistency.
These two are a potent pair and similarly to how Pelipper has been ranked in the past almost solely based on the viability of rain in general, I believe these two should get a rise based on the success of Hail teams overall.