I figured it might be more of a Blizzard thing than a WarcraftPets one, due to the info here coming from Armoury. Oh well.

Thanks for the reply!

I have just noticed that rarity of the non-combat pets (like the guild page/herald and the player-made kites) as indicated by the border colour on the "My Collection" page doesn't update when the rarity of the pet changes in-game. To clarify: i have upgraded ALL of my Humanoid pets (which, in the pe...