Well, perhaps the fact that Zoroark is dark type and Lycanroc midnight form evolves at night may be an accidental confirmation of convergent evolution earlier than intended, it may be a little far fetched, but it is something that Pokemon has done before. For instance, they did it with mega evolution in the OG Indigo league anime when Misty was trying to catch some "mythical" never before seen sea monster, or the many instances of Game Freak referencing future games in the past, like for instance with the grape and orange wallpaper in SM/USUM. So, this is just my long-winded answer of saying it MIGHT be possible this relation to these two specific Pokemon is canon, if this helps, then you're welcome