Maybe they plan to 'Wowitize' content so you are guarateed at least one of the rarest drops, whether 'Blue' or 'Green', every run, so that will be one Darklight every dungeon run that drops darklight, or whatever blue gear it drops. Maybe 2. . .

Maybe Yoshi-P is blowing smoke and drop rates will still be at abismal levels and people will still spam everything :/